HD 21520 b: a warm sub-Neptune transiting a bright G dwarf

IF 4.7 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-05 DOI:10.1093/mnras/stae2079

Molly Nies, Ismael Mireles, François Bouchy, Diana Dragomir, Belinda A Nicholson, Nora L Eisner, Sergio G Sousa, Karen A Collins, Steve B Howell, Carl Ziegler, Coel Hellier, Brett Addison, Sarah Ballard, Brendan P Bowler, César Briceño, Catherine A Clark, Dennis M Conti, Xavier Dumusque, Billy Edwards, Crystal L Gnilka, Melissa Hobson, Jonathan Horner, Stephen R Kane, John Kielkopf, Baptiste Lavie, Nicholas Law, Monika Lendl, Colin Littlefield, Huigen Liu, Andrew W Mann, Matthew W Mengel, Dominic Oddo, Jack Okumura, Enric Palle, Peter Plavchan, Angelica Psaridi, Nuno C Santos, Richard P Schwarz, Avi Shporer, Robert A Wittenmyer, Duncan J Wright, Hui Zhang, David Watanabe, Jennifer V Medina, Joel Villaseñor, Eric B Ting, Jessie L Christiansen, Joshua N Winn, Keivan G Stassun, S Seager, David W Latham, George R Ricker

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Abstract

We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Teff = 5871 ± 62 K, R⋆ = 1.04 ± 0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two planet candidates with periods of 703.6 and 46.4 days. However, our analysis supports instead a single-planet system with an orbital period of 25.1292 ± 0.0001 days and radius of 2.70 ± 0.09 R⊕. Three full transits in sectors 4, 30 and 31 match this period and have transit depths and durations in agreement with each other, as does a partial transit in sector 3. We also observe transits using CHEOPS and LCOGT. SOAR and Gemini high-resolution imaging do not indicate the presence of any nearby companions, and Minerva-Australis and CORALIE radial velocities rule out an on-target spectroscopic binary. Additionally, we use ESPRESSO radial velocities to obtain a tentative mass measurement of $7.9^{+3.2}_{-3.0}\, M_{\hbox{$\oplus $}}$, with a 3-σ upper limit of 17.7 M⊕. Due to the bright nature of its host and likely significant gas envelope of the planet, HD 21520 b is a promising candidate for further mass measurements and for atmospheric characterization.

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HD 21520 b：一颗温暖的亚海王星凌日一颗明亮的G矮星

我们报告了HD 21520 b的发现和验证情况，这是一颗用TESS发现的凌日行星，围绕一颗明亮的G矮星（V=9.2，Teff = 5871 ± 62 K，R⋆ = 1.04 ± 0.02 R⊙）运行。HD 21520 b最初被认为是一个由两颗行星组成的系统（TOI-4320），这两颗行星的周期分别为703.6天和46.4天。然而，我们的分析支持的是一个单行星系统，其轨道周期为 25.1292 ± 0.0001 天，半径为 2.70 ± 0.09 R⊕。第 4、30 和 31 扇区的三次完全凌日与这一周期相吻合，凌日深度和持续时间也相互吻合，第 3 扇区的一次部分凌日也是如此。我们还利用 CHEOPS 和 LCOGT 观测了凌日。SOAR 和双子座高分辨率成像没有显示附近有任何伴星存在，密涅瓦-奥斯特拉利斯和 CORALIE 的径向速度也排除了目标上有光谱双星的可能性。此外，我们还利用ESPRESSO的径向速度得到了一个暂定的质量测量值：$7.9^{+3.2}_{-3.0}/, M_{\hbox{$\$oplus$}}$，3-σ上限为17.7 M⊕。由于HD 21520 b的宿主非常明亮，而且这颗行星可能有大量的气体包层，因此它很有希望成为进一步测量质量和描述大气特征的候选行星。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Monthly Notices of the Royal Astronomical Society ASTRONOMY & ASTROPHYSICS-

CiteScore

9.10

自引率

37.50%

发文量

3198

审稿时长

3 months

期刊介绍： Monthly Notices of the Royal Astronomical Society is one of the world''s leading primary research journals in astronomy and astrophysics, as well as one of the longest established. It publishes the results of original research in positional and dynamical astronomy, astrophysics, radio astronomy, cosmology, space research and the design of astronomical instruments.