GJ 3929: High-precision Photometric and Doppler Characterization of an Exo-Venus and Its Hot, Mini-Neptune-mass Companion-猫眼课题宝

DOI：

10.3847/1538-4357/ac8480

发表时间：

2022-07

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

C. Beard;Paul Robertson;S. Kanodia;J. Lubin;C. Cañas;Arvind F. Gupta;R. Holcomb;Sinclaire Jones;J. Libby-Roberts;Andrea S. J. Lin;S. Mahadevan;G. Stef'ansson;C. Bender;C. Blake;W. Cochran;M. Endl;Mark Everett;E. Ford;C. Fredrick;S. Halverson;L. Hebb;Dan Li;S. Logsdon;J. Luhn;M. McElwain;A. Metcalf;J. Ninan;J. Rajagopal;Arpita Roy;Mary C. Schutte;C. Schwab;R. Terrien;J. Wisniewski;J. Wright

我们详细描述了由TESS发现的凌日金星GJ 3929b(TOI-2013b)及其非凌日伴星GJ 3929c(TOI-2013c)的跟踪和表征。GJ3929b是一颗地球大小的系外行星，位于其恒星的金星带(Pb=2.616272±0.000005天；S b=17.3−0.7+0.8 S⊕)，绕其附近的一颗M矮星运行。GJ 3929c极有可能是一颗不凌日的次海王星。在基特峰国家天文台WIYN 3.5m望远镜上使用新的超精密NeID谱仪，我们能够修正以前工作中报道的b星的质量约束，从而将质量测量的意义提高到近4σ的置信度(Mb=1.75±0.45M⊕)。我们进一步将c行星的轨道周期从其别名14.30±0.03天调整为可能的15.04±0.03天，并将其最小质量调整为msini=5.71±0.92M⊕。利用阿帕奇点天文台ARC 3.5米望远镜上的漫射器辅助北极成像仪，加上公开提供的TESS和LCOGT测光，我们能够将b行星的半径限制在Rp=1.0 9±0.0 4R⊕。在GJ 3929b的大小范围内(TSM=14±4)，GJ 3929b是透射谱的最佳候选者，未来对GJ 3929b的大气研究将有助于揭示围绕M矮星运行的小行星的性质。

We detail the follow-up and characterization of a transiting exo-Venus identified by TESS, GJ 3929b (TOI-2013b), and its nontransiting companion planet, GJ 3929c (TOI-2013c). GJ 3929b is an Earth-sized exoplanet in its star’s Venus zone (P b = 2.616272 ± 0.000005 days; S b = 17.3−0.7+0.8 S ⊕) orbiting a nearby M dwarf. GJ 3929c is most likely a nontransiting sub-Neptune. Using the new, ultraprecise NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak National Observatory, we are able to modify the mass constraints of planet b reported in previous works and consequently improve the significance of the mass measurement to almost 4σ confidence (M b = 1.75 ± 0.45 M ⊕). We further adjust the orbital period of planet c from its alias at 14.30 ± 0.03 days to the likely true period of 15.04 ± 0.03 days, and we adjust its minimum mass to msini = 5.71 ± 0.92 M ⊕. Using the diffuser-assisted ARCTIC imager on the ARC 3.5 m telescope at Apache Point Observatory, in addition to publicly available TESS and LCOGT photometry, we are able to constrain the radius of planet b to R p = 1.09 ± 0.04 R ⊕. GJ 3929b is a top candidate for transmission spectroscopy in its size regime (TSM = 14 ± 4), and future atmospheric studies of GJ 3929b stand to shed light on the nature of small planets orbiting M dwarfs.

GJ 3929: High-precision Photometric and Doppler Characterization of an Exo-Venus and Its Hot, Mini-Neptune-mass Companion

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