arXiv - PHYS - Earth and Planetary Astrophysics最新文献_第9页

Jovian Vortex Hunter: a citizen science project to study Jupiter's vortices 木星旋涡猎手：研究木星旋涡的公民科学项目

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-08 DOI: arxiv-2408.04772

Ramanakumar Sankar, Shawn Brueshaber, Lucy Fortson, Candice Hansen-Koharcheck, Chris Lintott, Cooper Nesmith, Glenn Orton

{"title":"Jovian Vortex Hunter: a citizen science project to study Jupiter's vortices","authors":"Ramanakumar Sankar, Shawn Brueshaber, Lucy Fortson, Candice Hansen-Koharcheck, Chris Lintott, Cooper Nesmith, Glenn Orton","doi":"arxiv-2408.04772","DOIUrl":"https://doi.org/arxiv-2408.04772","url":null,"abstract":"The Jovian atmosphere contains a wide diversity of vortices, which have a\u0000large range of sizes, colors and forms in different dynamical regimes. The\u0000formation processes for these vortices is poorly understood, and aside from a\u0000few known, long-lived ovals, such as the Great Red Spot, and Oval BA, vortex\u0000stability and their temporal evolution are currently largely unknown. In this\u0000study, we use JunoCam data and a citizen-science project on Zooniverse to\u0000derive a catalog of vortices, some with repeated observations, through May 2018\u0000to Sep 2021, and analyze their associated properties, such as size, location\u0000and color. We find that different colored vortices (binned as white, red, brown\u0000and dark), follow vastly different distributions in terms of their sizes and\u0000where they are found on the planet. We employ a simplified stability criterion\u0000using these vortices as a proxy, to derive a minimum Rossby deformation length\u0000for the planet of $sim1800$ km. We find that this value of $L_d$ is largely\u0000constant throughout the atmosphere, and does not have an appreciable meridional\u0000gradient.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931829","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

Mathieu equation as a result of Laplace perturbation theory in the restricted three body problem 受限三体问题中作为拉普拉斯微扰理论结果的马修方程

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-08 DOI: arxiv-2408.04298

Alexey Rosaev, Eva Plavalova

引用次数: 0

Generative Design of Periodic Orbits in the Restricted Three-Body Problem 受限三体问题中周期轨道的生成设计

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-07 DOI: arxiv-2408.03691

Alvaro Francisco Gil, Walther Litteri, Victor Rodriguez-Fernandez, David Camacho, Massimiliano Vasile

引用次数: 0

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21 利用多个来源的光度测量减轻精确径向速度中的恒星变异性：开普勒-21 案例研究

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-06 DOI: arxiv-2408.02873

Corey Beard, Paul Robertson, Mark R. Giovinazzi, Joseph M. Akana Murphy, Eric B. Ford, Samuel Halverson, Te Han, Rae Holcomb, Jack Lubin, Rafael Luque, Pranav Premnath, Chad F. Bender, Cullen H. Blake, Qian Gong, Howard Isaacson, Shubham Kanodia, Dan Li, Andrea S. J. Lin, 5 Sarah E. Logsdon, Emily Lubar, Michael W. McElwain, Andrew Monson, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Gudmundur Stefansson, Ryan C. Terrien, Jason T. Wright

{"title":"Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21","authors":"Corey Beard, Paul Robertson, Mark R. Giovinazzi, Joseph M. Akana Murphy, Eric B. Ford, Samuel Halverson, Te Han, Rae Holcomb, Jack Lubin, Rafael Luque, Pranav Premnath, Chad F. Bender, Cullen H. Blake, Qian Gong, Howard Isaacson, Shubham Kanodia, Dan Li, Andrea S. J. Lin, 5 Sarah E. Logsdon, Emily Lubar, Michael W. McElwain, Andrew Monson, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Gudmundur Stefansson, Ryan C. Terrien, Jason T. Wright","doi":"arxiv-2408.02873","DOIUrl":"https://doi.org/arxiv-2408.02873","url":null,"abstract":"We present a new analysis of Kepler-21, the brightest (V = 8.5) Kepler system\u0000with a known transiting exoplanet, Kepler-21 b. Kepler-21 b is a radius valley\u0000planet ($R = 1.6pm 0.2 R_{oplus}$) with an Earth-like composition\u0000(8.38$pm$1.62 g/cc), though its mass and radius fall in the regime of possible\u0000\"water worlds.\" We utilize new Keck/HIRES and WIYN/NEID radial velocity (RV)\u0000data in conjunction with Kepler and TESS photometry to perform a detailed study\u0000of activity mitigation between photometry and RVs. We additionally refine the\u0000system parameters, and we utilize Gaia astrometry to place constraints on a\u0000long-term RV trend. Our activity analysis affirms the quality of Kepler\u0000photometry for removing correlated noise from RVs, despite its temporal\u0000distance, though we reveal some cases where TESS may be superior. Using refined\u0000orbital parameters and updated composition curves, we rule out a ``water world\"\u0000scenario for Kepler-21 b, and we identify a long period super-Jupiter planetary\u0000candidate, Kepler-21 (c).","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968667","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 framework for incorporating binding energy distribution in gas-ice astrochemical models 将结合能分布纳入气冰天体化学模型的框架

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-06 DOI: arxiv-2408.02958

Kenji Furuya

{"title":"A framework for incorporating binding energy distribution in gas-ice astrochemical models","authors":"Kenji Furuya","doi":"arxiv-2408.02958","DOIUrl":"https://doi.org/arxiv-2408.02958","url":null,"abstract":"One of the most serious limitations of current astrochemical models with the\u0000rate equation (RE) approach is that only a single type of binding site is\u0000considered in grain surface chemistry, although laboratory and quantum chemical\u0000studies have found that surfaces contain various binding sites with different\u0000potential energy depths. When various sites exist, adsorbed species can be\u0000trapped in deep potential sites, increasing the resident time on the surface.\u0000On the other hand, adsorbed species can be populated in shallow sites,\u0000activating thermal hopping and thus two-body reactions even at low\u0000temperatures, where the thermal hopping from deeper sites is not activated.\u0000Such behavior cannot be described by the conventional RE approach. In this\u0000work, I present a framework for incorporating various binding sites (i.e.,\u0000binding energy distribution) in gas-ice astrochemical models as an extension of\u0000the conventional RE approach. I propose a simple method to estimate the\u0000probability density function for the occupation of various sites by adsorbed\u0000species, assuming a quasi-steady state. By using thermal desorption and hopping\u0000rates weighted by the probability density functions, the effect of binding\u0000energy distribution is incorporated into the RE approach without increasing the\u0000number of ordinary differential equations to be solved. This method is found to\u0000be accurate and computationally efficient and enables us to consider binding\u0000energy distribution even for a large gas-ice chemical network, which contains\u0000hundreds of icy species. The impact of the binding energy distribution on\u0000interstellar ice composition is discussed quantitatively for the first time.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931836","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

Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST 利用 HST 寻找从 120 Myr 远海王星 HIP94235b 逃逸的中性氢

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-05 DOI: arxiv-2408.02170

Ava Morrissey, George Zhou, Chelsea X. Huang, Duncan Wright, Caitlin Auger, Keighley E. Rockcliffe, Elisabeth R. Newton, James G. Rogers, Neale Gibson, Nataliea Lowson, Laura C. Mayorga, Robert A. Wittenmyer

{"title":"Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST","authors":"Ava Morrissey, George Zhou, Chelsea X. Huang, Duncan Wright, Caitlin Auger, Keighley E. Rockcliffe, Elisabeth R. Newton, James G. Rogers, Neale Gibson, Nataliea Lowson, Laura C. Mayorga, Robert A. Wittenmyer","doi":"arxiv-2408.02170","DOIUrl":"https://doi.org/arxiv-2408.02170","url":null,"abstract":"HIP94235 b, a 120 Myr old sub-Neptune, provides us the unique opportunity to\u0000study mass loss at a pivotal stage of the system's evolution: the end of a 100\u0000million year (Myr) old phase of intense XUV irradiation. We present two\u0000observations of HIP94235 b using the Hubble Space Telescope's Space Telescope\u0000Imaging Spectrograph (HST/STIS) in the Ly-alpha wavelength region. We do not\u0000observe discernible differences across either the blue and red wings of the\u0000Ly-alpha line profile in and out of transit, and report no significant\u0000detection of outflowing neutral hydrogen around the planet. We constrain the\u0000rate of neutral hydrogen escaping HIP94235 b to an upper limit of 10^13 g/s,\u0000which remains consistent with energy-limited model predictions of 10^11 g/s.\u0000The Ly-alpha non-detection is likely due to the extremely short photoionization\u0000timescale of the neutral hydrogen escaping the planet's atmosphere. This\u0000timescale, approximately 15 minutes, is significantly shorter than that of any\u0000other planets with STIS observations. Through energy-limited mass loss models,\u0000we anticipate that HIP94235 b will transition into a super-Earth within a\u0000timescale of 1 Gyr.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931835","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

Delivery of DART Impact Ejecta to Mars and Earth: Opportunity for Meteor Observations 向火星和地球运送 DART 撞击喷射物：流星观测的机遇

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-05 DOI: arxiv-2408.02836

Eloy Peña-Asensio, Michael Küppers, Josep M. Trigo-Rodríguez, Albert Rimola

{"title":"Delivery of DART Impact Ejecta to Mars and Earth: Opportunity for Meteor Observations","authors":"Eloy Peña-Asensio, Michael Küppers, Josep M. Trigo-Rodríguez, Albert Rimola","doi":"arxiv-2408.02836","DOIUrl":"https://doi.org/arxiv-2408.02836","url":null,"abstract":"NASA's DART and ESA's Hera missions offer a unique opportunity to investigate\u0000the delivery of impact ejecta to other celestial bodies. We performed ejecta\u0000dynamical simulations using 3 million particles categorized into three size\u0000populations (10 cm, 0.5 cm, and 30 $mu$m) and constrained by early post-impact\u0000LICIACube observations. The main simulation explored ejecta velocities ranging\u0000from 1 to 1,000 m/s, while a secondary simulation focused on faster ejecta with\u0000velocities from 1 to 2 km/s. We identified DART ejecta orbits compatible with\u0000the delivery of meteor-producing particles to Mars and Earth. Our results\u0000indicate the possibility of ejecta reaching the Mars Hill sphere in 13 years\u0000for launch velocities around 450 m/s, which is within the observed range. Some\u0000ejecta particles launched at 770 m/s could reach Mars's vicinity in 7 years.\u0000Faster ejecta resulted in a higher flux delivery towards Mars and particles\u0000impacting the Earth Hill sphere above 1.5 km/s. The delivery process is\u0000slightly sensitive to the initial observed cone range and driven by synodic\u0000periods. The launch locations for material delivery to Mars were predominantly\u0000northern the DART impact site, while they displayed a southwestern tendency for\u0000the Earth-Moon system. Larger particles exhibit a marginally greater likelihood\u0000of reaching Mars, while smaller particles favor delivery to Earth-Moon,\u0000although this effect is insignificant. To support observational campaigns for\u0000DART-created meteors, we provide comprehensive information on the encounter\u0000characteristics (orbital elements and radiants) and quantify the orbital\u0000decoherence degree of the released meteoroids.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968669","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

Rossby wave instability in weakly ionized protoplanetary disks. II. radial B-fields 弱电离原行星盘中的罗斯比波不稳定性。二、径向 B 场

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-05 DOI: arxiv-2408.02556

Can Cui, Zijin Wang

引用次数: 0

Numerical Simulations of Magnetic Effects on Zonal Flows in Giant Planets 巨行星带状流磁场效应的数值模拟

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-03 DOI: arxiv-2408.01650

Shanshan Xue, Yufeng Lin

{"title":"Numerical Simulations of Magnetic Effects on Zonal Flows in Giant Planets","authors":"Shanshan Xue, Yufeng Lin","doi":"arxiv-2408.01650","DOIUrl":"https://doi.org/arxiv-2408.01650","url":null,"abstract":"Jupiter and Saturn exhibit alternating east-west jet streams as seen from\u0000surface. The origin of these zonal flows has been debated for decades. The\u0000high-precision gravity measurements by Juno mission and the grand finale of\u0000Cassini mission have revealed that the zonal flows observed at the surface may\u0000extend several thousand kilometres deep and stop around the transition region\u0000from molecular to metallic hydrogen, suggesting the magnetic braking effect on\u0000zonal flows. In this study, we perform a set of magnetohydrodynamic simulations\u0000in a spherical shell with radially variable electrical conductivity to\u0000investigate the interaction between magnetic fields and zonal flows. A key\u0000feature of our numerical models is that we impose a background dipole magnetic\u0000field on the anelastic rotating convection. By varying the strength of the\u0000imposed magnetic field and the vigor of convection, we investigate how the\u0000magnetic field interacts with the convective motions and the convection-driven\u0000zonal flows. Our simulations reveal that the magnetic field tends to destroy\u0000zonal flows in the metallic hydrogen and suppress zonal flows in the molecular\u0000envelope, while the magnetic field may enhance the radial convective motions.\u0000We extract a quantitative relation between the magnetic field strength and the\u0000amplitude of zonal flows at the surface through our simulations, which roughly\u0000matches the observed magnetic field and zonal wind speed of Jupiter and Saturn.\u0000This discovery provides support from a new perspective for the scenario of deep\u0000convection-driven zonal winds which are confined to the molecular hydrogen\u0000layers in giant planets.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968668","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 pre-perihelion evolution of the activity of comet C/2017 K2 (PANSTARRS) during the water ice-line crossover 水冰线交叉期间 C/2017 K2（PANSTARRS）彗星活动的近日点前演变

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-08-03 DOI: arxiv-2408.01636

Yuna G. Kwon, Stefano Bagnulo, Johannes Markkanen, Ludmilla Kolokolova, Jessica Agarwal, Manuela Lippi, Zuri Gray

{"title":"The pre-perihelion evolution of the activity of comet C/2017 K2 (PANSTARRS) during the water ice-line crossover","authors":"Yuna G. Kwon, Stefano Bagnulo, Johannes Markkanen, Ludmilla Kolokolova, Jessica Agarwal, Manuela Lippi, Zuri Gray","doi":"arxiv-2408.01636","DOIUrl":"https://doi.org/arxiv-2408.01636","url":null,"abstract":"Comets, relics from the early solar system, consist of dust and ice. The ice\u0000sublimates as comets approach the Sun, ejecting dust from their nuclei seen as\u0000activity. Different volatiles sublimate at different Sun-comet distances and\u0000eject dust of unique sizes, structures, and compositions. In this study, we\u0000present new polarimetric observations of Oort-cloud comet C/2017 K2 (PANSTARRS)\u0000in R and I-filter domains before, during, and after its crossover of the\u0000water-ice sublimation regime at phase angles of 15.9arcdeg, 10.5arcdeg, and\u000020.0arcdeg, respectively. Combining multiband optical imaging data covering a\u0000wide range of heliocentric distances ($sim$14$-$2.3 au), we aim to\u0000characterize the preperihelion evolution of cometary activity as well as the\u0000properties of its coma dust. Two discontinuous brightening events were\u0000observed: at $sim$6 au presumably associated with changes in CO-like\u0000supervolatile ice activity, and at $sim$2.9 au when water ice took over.\u0000Particularly, the latter activation is accompanied by changes in coma\u0000morphology and color whose trends differ between the inner ($sim$10$^3$-km)\u0000and outer ($sim$10$^4$-km) parts of the coma. No polarimetric discontinuities\u0000on the comet were observed over the inner coma region, all epochs showing\u0000phase-angle and wavelength dependencies compatible with those of active comets\u0000observed in similar observing geometry. During this period, the underlying dust\u0000continuum overwhelmed H$alpha$ emission at around 656.3 nm, suggesting less\u0000water ice on the comet's surface than expected. We discuss K2's coma\u0000environment by combining numerical simulations of light scattered by dust and\u0000place the observations within the context of the comet's evolution.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968670","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