The Astrophysical Journal Letters最新文献_第2页

The Intracluster Light Analysis of the Most Evolved Systems of Galaxies: Fossil Groups 最演化星系的星系团内光分析：化石群

The Astrophysical Journal Letters Pub Date : 2025-07-21 DOI: 10.3847/2041-8213/aded0c

Nícolas O. L. de Oliveira, Yolanda Jiménez-Teja, Renato A. Dupke, Eleazar R. Carrasco, Anton M. Koekemoer, Yuanyuan Su, Jose Manuel Vilchez, Jimmy A. Irwin, Eric D. Miller and Lucas E. Johnson

{"title":"The Intracluster Light Analysis of the Most Evolved Systems of Galaxies: Fossil Groups","authors":"Nícolas O. L. de Oliveira, Yolanda Jiménez-Teja, Renato A. Dupke, Eleazar R. Carrasco, Anton M. Koekemoer, Yuanyuan Su, Jose Manuel Vilchez, Jimmy A. Irwin, Eric D. Miller and Lucas E. Johnson","doi":"10.3847/2041-8213/aded0c","DOIUrl":"https://doi.org/10.3847/2041-8213/aded0c","url":null,"abstract":"We present the analysis of the intracluster light (ICL) in three fossil groups, RX J085640.72+055347.36, RX J1136+0713, and RX J1410+4145, at z ∼ 0.1. We used two optical broadband filters, F435W and F606W, observed with the Hubble Space Telescope, and spectroscopic data obtained with the Gemini Multi-Object Spectrograph to generate the ICL maps and measure the ICL fraction using CICLE, an algorithm developed to disentangle the ICL from the light of galaxies. We found ICL fractions of 9.9%–14.4%, 3.8%–6.1%, and 4.7%–10.7% for RXJ0856, RXJ1136, and RXJ1410, respectively. This behavior is not consistent with the presence of the ICL fraction excess previously observed in merging clusters, and is also inconsistent with the constant ICL fraction distribution characteristic of relaxed systems, although the values found are within the typical range expected for the latter. Instead, they show a significantly increasing trend with wavelengths over ∼3800–5500 Å, indicating that fossil groups are indeed old and undisturbed systems, even compared with regular relaxed clusters.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144684794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silicate Sundogs: Probing the Effects of Grain Directionality in Exoplanet Observations 硅酸盐太阳：探测系外行星观测中颗粒方向性的影响

The Astrophysical Journal Letters Pub Date : 2025-07-20 DOI: 10.3847/2041-8213/ade885

Elijah Mullens and Nikole K. Lewis

{"title":"Silicate Sundogs: Probing the Effects of Grain Directionality in Exoplanet Observations","authors":"Elijah Mullens and Nikole K. Lewis","doi":"10.3847/2041-8213/ade885","DOIUrl":"https://doi.org/10.3847/2041-8213/ade885","url":null,"abstract":"Crystalline ice in Earth’s atmosphere can produce spectacular phenomena due to orientation-dependent attenuation, such as sundogs and halos, providing diagnostics of the external processes acting on the aerosol grains. Crystalline mineral aerosols, such as quartz (SiO2) and enstatite/forsterite (MgSiO3/Mg2SiO4), have long been predicted to form in hot Jupiter atmospheres, with JWST’s Mid-Infrared Instrument Low Resolution Spectrometer (MIRI LRS) verifying the existence of crystalline quartz observationally. Due to the strong horizontal winds (∼1–5 km s−1) and small aerosol grains (<1 μm) found in hot Jupiter atmospheres, we show that aerosols could be mechanically aligned with the winds. We then derive direction-dependent optical properties of quartz, enstatite, and forsterite and model transmission and emission spectra assuming random and mechanically aligned orientations, finding that the orientation of all three crystalline aerosols can impart ≥100 ppm differences in observed spectra (8–12 μm). We run retrievals on JWST/MIRI LRS transmission and emission data of WASP-17b, and find that directionality alone cannot physically explain the transmission data, pointing towards polymorphs or insufficient laboratory data, and find weak hints of directionality (1.0–1.3σ) in the emission data. This work demonstrates the power of JWST/MIRI LRS in detecting aerosol directionality with future observations, and a technique by which to probe how aerosols interact with atmospheric dynamical processes. To foster the exploration of aerosols in exoplanet data, the open-source code POSEIDON has been updated (v1.3.1) to include 144 new direction- and temperature-dependent aerosols with precomputed optical properties, alongside new aerosol models.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"143 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Indication for a Compact Object Next to a LIGO–Virgo Binary Black Hole Merger 表明在ligo -室女座双黑洞合并旁边有一个紧凑的物体

The Astrophysical Journal Letters Pub Date : 2025-07-20 DOI: 10.3847/2041-8213/adeaad

Shu-Cheng Yang, Wen-Biao Han, Hiromichi Tagawa, Song Li and Chen Zhang

{"title":"Indication for a Compact Object Next to a LIGO–Virgo Binary Black Hole Merger","authors":"Shu-Cheng Yang, Wen-Biao Han, Hiromichi Tagawa, Song Li and Chen Zhang","doi":"10.3847/2041-8213/adeaad","DOIUrl":"https://doi.org/10.3847/2041-8213/adeaad","url":null,"abstract":"The astrophysical origin of binary black hole (BBH) mergers remains uncertain, although many events have been observed by the LIGO–Virgo–KAGRA network. Such mergers are potentially originated in the vicinity of massive black holes (MBHs). GW190814, due to its secondary mass and mass ratio being beyond the expectations of isolated stellar evolution theories, is a promising event that has occurred in an active galactic nucleus (AGN) disk. In this model, a compact object resides in the vicinity of a merging BBH. Here we report multiple pieces of evidence suggesting that GW190814 is a BBH merging near a compact object. The orbital motion of BBHs around a third body produces a line-of-sight acceleration (LSA) and induces a varying Doppler shift. Using a waveform template that considers LSA, we perform Bayesian inference on a few BBH events with a high signal-to-noise ratio in the gravitational-wave (GW) transient catalog. Compared to the model for isolated BBH mergers, we obtain significantly higher network signal-to-noise ratios for GW190814 with the inclusion of LSA, constraining the LSA to at a 90% confidence level. Additionally, the Bayes factor for the LSA case over the isolated case is 58/1, indicating that the LSA model is strongly preferred by the GW data. We conclude that this is the first indication showing merging BBHs are located near a third compact object.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic Field Monitoring of Four Massive A–F Supergiants * 四颗巨大A-F超巨星的磁场监测*

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/ade9ac

Gregg A. Wade, Mary Oksala, Coralie Neiner, Étienne Boucher and James A. Barron

{"title":"Magnetic Field Monitoring of Four Massive A–F Supergiants *","authors":"Gregg A. Wade, Mary Oksala, Coralie Neiner, Étienne Boucher and James A. Barron","doi":"10.3847/2041-8213/ade9ac","DOIUrl":"https://doi.org/10.3847/2041-8213/ade9ac","url":null,"abstract":"We report magnetic field measurements spanning about 15 yr of four massive (7.5–15 M⊙) supergiant stars: α Per (HD 20902, F5Iab), α Lep (HD 36673A, F0Ib), η Leo (HD 87737, A0Ib) and 13 Mon (HD 46300, A1Ib). For each star, spectropolarimetric observations were collected using ESPaDOnS at the Canada–France–Hawaii Telescope. The observed spectra were coadded, normalized, and then processed using least-squares deconvolution to yield mean Stokes I and V profiles. Each spectrum was analyzed to infer the false-alarm probability of signal detection, and the longitudinal magnetic field was measured. This process yielded persistent detection of magnetic fields in all four stars. The median 1σ longitudinal field uncertainty of the Zeeman detections was 0.6 G. The maximum unsigned longitudinal magnetic fields measured from the detections are rather weak, ranging from 0.34 ± 0.19 G for α Lep to 2.61 ± 0.55 G for 13 Mon. The Zeeman signatures show different levels of complexity; those of the two hotter stars are relatively simple, while those of the two cooler stars are more complex. The stars also exhibited different levels of variability of their Zeeman signatures and longitudinal fields. We report periodic variability of the longitudinal field and (complex) Stokes V profiles of α Per with a period of either 50.75 days or 90 days. The (simple) Stokes V profiles of 13 Mon, and probably those of η Leo, show global polarity changes once during the period of observation, but the data are insufficient to place strong constraints on the variability timescales.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Cosmic Evolution and Spatial Distribution of Multiphase Gas Associated with QSOs 与QSOs相关的多相气体的宇宙演化与空间分布

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/ade545

Zeyu Chen, Enci Wang, Hu Zou, Haoran Yu, Zhicheng He, Huiyuan Wang, Yang Gao, Cheqiu Lyu, Cheng Jia, Chengyu Ma, Weiyu Ding, Runyu Zhu and Xu Kong

{"title":"The Cosmic Evolution and Spatial Distribution of Multiphase Gas Associated with QSOs","authors":"Zeyu Chen, Enci Wang, Hu Zou, Haoran Yu, Zhicheng He, Huiyuan Wang, Yang Gao, Cheqiu Lyu, Cheng Jia, Chengyu Ma, Weiyu Ding, Runyu Zhu and Xu Kong","doi":"10.3847/2041-8213/ade545","DOIUrl":"https://doi.org/10.3847/2041-8213/ade545","url":null,"abstract":"We investigate the multiphase gas surrounding QSOs traced by 33 absorption lines (e.g., Lyα, C iv, Fe ii, Mg ii, etc.) in the stacked spectra of background sources, using the Early Data Release from the Dark Energy Spectroscopic Instrument. Our analysis reveals that the equivalent width (W) of metal absorption lines decreases with increasing redshift, following an overall trend described by W ∝ (1 + z)−4.0±2.7. Different species that trace multiphases of QSO-associated gas exhibit distinct evolutionary patterns. Additionally, the W of these absorption lines decreases with distance (D) from QSOs, which can be effectively characterized by a two-halo model. Compared to the projected two point correlation function of galaxies at similar redshifts, low-ionization ions exhibit similar clustering scales, while high-ionization ions show a significantly more extended spatial distribution. We also find that WFeII/WMgII increases toward lower redshifts, which can be attributed to evolving star formation histories and/or changes in initial mass function for galaxies. By leveraging multiple absorption tracers, we conduct the first comprehensive investigation of diffuse, multiphase gas from the circumgalactic medium to cosmological scales, offering new insights into baryon cycles and the transport of metals throughout cosmic time.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Breaking the Mass Inclination Degeneracy of Radial Velocity Measurements via Monitoring von Zeipel–Lidov–Kozai Cycles: Implications in the HD 41004 System 通过监测von Zeipel-Lidov-Kozai周期打破径向速度测量的质量倾角简并：对hd41004系统的影响

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/adea69

Zhizhen Qin, 至臻秦, Shang-Fei Liu, 尚飞刘, Bo Ma, 波马, Fabo Feng and 发波冯

{"title":"Breaking the Mass Inclination Degeneracy of Radial Velocity Measurements via Monitoring von Zeipel–Lidov–Kozai Cycles: Implications in the HD 41004 System","authors":"Zhizhen Qin, 至臻秦, Shang-Fei Liu, 尚飞刘, Bo Ma, 波马, Fabo Feng and 发波冯","doi":"10.3847/2041-8213/adea69","DOIUrl":"https://doi.org/10.3847/2041-8213/adea69","url":null,"abstract":"We investigate the dynamical stability of the S-type planet in the compact binary HD 41004. Using N-body simulations, we find that the planet could be dynamically stable at a mutual inclination angle of up to ∼75°. The von Zeipel–Lidov–Kozai (vZLK) mechanism becomes active when the mutual inclination is greater than 39 2. High-inclination orbits exhibit coupled oscillations in eccentricity and inclination, along with apsidal precession. Synthetic radial velocity (RV) modeling shows that these secular variations produce measurable signatures across a broad range of timescales, from full vZLK cycles to observationally accessible decades. For instance, a high mutual inclination at 75° can induce RV drifts exceeding 5 m s−1 per planetary orbit (∼1.9 m s−1 yr−1) in circular binary configurations. The presence of eccentric vZLK further accelerates these drifts, enhancing the detectability. Long-term RV observations of this system offer a unique pathway to dynamically constrain the orbital inclination and thus determine the true mass of HD 41004 Ab. The degeneracy of mass inclination is well known when using RV measurements alone. Our results highlight that HD 41004 Ab and potentially other S-type planets in compact binaries are promising targets for breaking such a degeneracy by studying the dynamics induced by the vZLK mechanism through long-term high-precision RV monitoring.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acceleration of Solar Eruptions via Enhanced Torus Instability Driven by Small-scale Flux Emergence 由小规模通量涌现驱动的环面不稳定性增强加速太阳爆发

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/adeab2

Satoshi Inoue, Takahiro Miyoshi, Keiji Hayashi, Huu Minh Triet Nguyen, Ju Jing, Wenda Cao and Haimin Wang

{"title":"Acceleration of Solar Eruptions via Enhanced Torus Instability Driven by Small-scale Flux Emergence","authors":"Satoshi Inoue, Takahiro Miyoshi, Keiji Hayashi, Huu Minh Triet Nguyen, Ju Jing, Wenda Cao and Haimin Wang","doi":"10.3847/2041-8213/adeab2","DOIUrl":"https://doi.org/10.3847/2041-8213/adeab2","url":null,"abstract":"Despite decades of research, the fundamental processes involved in the initiation and acceleration of solar eruptions remain not fully understood, making them long-standing and challenging problems in solar physics. Recent high-resolution observations by the Goode Solar Telescope have revealed small-scale magnetic flux emergence in localized regions of solar active areas prior to eruptions. Although much smaller in size than the entire active region, these emerging fluxes reached strengths of up to 2000 G. To investigate their impact, we performed data-constrained magnetohydrodynamic simulations. We find that while the small-scale emerging flux does not significantly alter the preeruption evolution, it dramatically accelerates the eruption during the main phase by enhancing the growth of torus instability, which emerges in the nonlinear stage. This enhancement occurs independently of the decay index profile. Our analysis indicates that even subtle differences in the preeruption evolution can strongly influence the subsequent dynamics, suggesting that small-scale emerging flux can play a critical role in accelerating solar eruptions.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Plasma Torus around a Young Low-mass Star 年轻的低质量恒星周围的等离子体环

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/ade39a

Luke G. Bouma and Moira M. Jardine

引用次数: 0

JWST/MIRI Reveals the True Number Density of Massive Galaxies in the Early Universe JWST/MIRI揭示了早期宇宙中大质量星系的真实数量密度

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/adebe7

Tao Wang, Hanwen Sun, Luwenjia Zhou, Ke Xu, Cheng Cheng, Zhaozhou Li, Yangyao Chen, H. J. Mo, Avishai Dekel, Tiancheng Yang, Yijun Wang, Longyue Chen, Xianzhong Zheng, Zheng Cai, David Elbaz, Y.-S. Dai and J.-S. Huang

{"title":"JWST/MIRI Reveals the True Number Density of Massive Galaxies in the Early Universe","authors":"Tao Wang, Hanwen Sun, Luwenjia Zhou, Ke Xu, Cheng Cheng, Zhaozhou Li, Yangyao Chen, H. J. Mo, Avishai Dekel, Tiancheng Yang, Yijun Wang, Longyue Chen, Xianzhong Zheng, Zheng Cai, David Elbaz, Y.-S. Dai and J.-S. Huang","doi":"10.3847/2041-8213/adebe7","DOIUrl":"https://doi.org/10.3847/2041-8213/adebe7","url":null,"abstract":"Early JWST studies reporting an unexpected abundance of massive galaxies at z ∼ 5–8 challenge galaxy formation models in the ΛCDM framework. Previous stellar mass (M⋆) estimates suffered from large uncertainties due to the lack of rest-frame near-infrared data. Using deep JWST/NIRCam and Mid-Infrared Instrument (MIRI) photometry from Public Release IMaging for Extragalactic Research, we systematically analyze massive galaxies at z ∼ 3–8, leveraging rest-frame ≳1 μm constraints. We find MIRI is critical for robust M⋆ measurements for massive galaxies at z > 5: excluding MIRI overestimates M⋆ by ∼0.4 dex on average for M⋆ > 1010M⊙ galaxies, with no significant effects at lower masses. This reduces number densities of M⋆ > 1010M⊙ (1010.3M⊙) galaxies by ∼36% (55%). MIRI inclusion also reduces “Little Red Dot” (LRD) contamination in massive galaxy samples, lowering the LRD fraction from ∼32% to ∼13% at M⋆ > 1010.3M⊙. Assuming pure stellar origins, LRDs exhibit M⋆ ∼ 109–10.5M⊙ with MIRI constraints, rarely exceeding 1010.5M⊙. Within standard ΛCDM, our results indicate a moderate increase in the baryon-to-star conversion efficiency (ϵ) toward higher redshifts and masses at z > 3. For the most massive z ∼ 8 galaxies, ϵ ∼ 0.3, compared to ϵ ≲ 0.2 for typical galaxies at z < 3. This result is consistent with models where high gas densities and short free-fall times suppress stellar feedback in massive high-z halos.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"5 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

VLT/ERIS Observations of the V960 Mon System: A Dust-embedded Substellar Object Formed by Gravitational Instability? V960月球系统的VLT/ERIS观测：由引力不稳定形成的尘埃嵌入的次恒星物体？

The Astrophysical Journal Letters Pub Date : 2025-07-17 DOI: 10.3847/2041-8213/ade996

Anuroop Dasgupta, Alice Zurlo, Philipp Weber, Francesco Maio, Lucas A. Cieza, Davide Fedele, Antonio Garufi, James Miley, Prashant Pathak, Sebastián Pérez and Veronica Roccatagliata

{"title":"VLT/ERIS Observations of the V960 Mon System: A Dust-embedded Substellar Object Formed by Gravitational Instability?","authors":"Anuroop Dasgupta, Alice Zurlo, Philipp Weber, Francesco Maio, Lucas A. Cieza, Davide Fedele, Antonio Garufi, James Miley, Prashant Pathak, Sebastián Pérez and Veronica Roccatagliata","doi":"10.3847/2041-8213/ade996","DOIUrl":"https://doi.org/10.3847/2041-8213/ade996","url":null,"abstract":"V960 Mon is an FU Orionis object that shows strong evidence of a gravitationally unstable spiral arm that is fragmenting into several dust clumps. We report the discovery of a new substellar companion candidate around this young star, identified in high-contrast -band imaging with Very Large Telescope/Enhanced Resolution Imager and Spectrograph. The object is detected at a projected separation of 0 898 ± 0 01 with a contrast of (8.39 ± 0.07) × 10−3. The candidate lies close to the clumps previously detected in the submillimeter (at 1.3 mm) and is co-located with extended polarized IR signal from scattered stellar irradiation, suggesting it is deeply embedded. The object is undetected in the SPHERE H-band total intensity, placing an upper mass limit of ∼38 MJup from the contrast curve. Using evolutionary models at an assumed age of 1 Myr, we estimate a mass of ∼660 MJup from the L′ brightness; however, this value likely includes a significant contribution from a disk around the companion. The discrepancy between near- and mid-infrared results again suggests the source is deeply embedded in dust. This candidate may represent an actively accreting, disk-bearing substellar object in a young, gravitationally unstable environment.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0