TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star

被引：4

作者：

Powers, Luke C. ^{[1
,2
]}

Libby-Roberts, Jessica ^{[1
,2
]}

Lin, Andrea S. J. ^{[1
,2
]}

Canas, Caleb I. ^{[1
,2
,3
]}

Kanodia, Shubham ^{[1
,2
,4
]}

Mahadevan, Suvrath ^{[1
,2
,5
]}

Ninan, Joe P. ^{[6
]}

Stefansson, Gudmundur ^{[7
]}

Gupta, Arvind F. ^{[1
,2
]}

Jones, Sinclaire ^{[7
,8
]}

Kobulnicky, Henry A. ^{[9
]}

Monson, Andrew ^{[10
]}

Parker, Brock A. ^{[9
]}

Swaby, Tera N. ^{[9
]}

Bender, Chad F. ^{[10
]}

Cochran, William D. ^{[11
]}

Hebb, Leslie

Metcalf, Andrew J.

Robertson, Paul

Schwab, Christian

Wisniewski, John

Wright, Jason T. ^{[1
,2
]}

机构：

[1] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[2] Penn State Univ, Ctr Exoplanets & Habitable Worlds, Davey Lab 525, University Pk, PA 16802 USA

[3] NASA Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

[4] Carnegie Inst Sci, Earth & Planets Lab, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[5] Swiss Fed Inst Technol, Inst Particle Phys & Astrophys, Zurich, Switzerland

[6] Tata Inst Fundamental Res, Dept Astron & Astrophys, Homi Bhabha Rd, Mumbai 400005, India

[7] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08540 USA

[8] Ohio State Univ, Dept Astron, McPherson Lab 4055, Columbus, OH 43210 USA

[9] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82070 USA

[10] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

[11] Univ Texas Austin, Ctr Planetary Syst Habitabil, Austin, TX USA

来源：

ASTRONOMICAL JOURNAL | 2023年 / 166卷 / 02期

基金：

美国国家科学基金会;

关键词：

ZONE PLANET FINDER; CA-II H; M-DWARF; GIANT PLANETS; WARM NEPTUNE; TRANSMISSION SPECTROSCOPY; TRANSITING EXOPLANET; INFRARED TRIPLET; MESA ISOCHRONES; SUPER-NEPTUNE;

D O I：

10.3847/1538-3881/acd8bf

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using both ground-based transit photometry and high-precision radial velocity spectroscopy, we confirm the planetary nature of TOI-3785 b. This transiting Neptune orbits an M2-Dwarf star with a period of similar to 4.67 days, a planetary radius of 5.14 +/- 0.16 R-circle plus, a mass of 14.95(-3.92)(+ 4.10) M-circle plus, and a density of rho = 0.61(-0.17)(+0.18) g cm(-3). TOI-3785 b + belongs to a rare population of Neptunes (4 R-circle plus < R-p < 7 R-circle plus) orbiting cooler, smaller M-dwarf host stars, of which only similar to 10 have been confirmed. By increasing the number of confirmed planets, TOI-3785 b offers an opportunity to compare similar planets across varying planetary and stellar parameter spaces. Moreover, with a high-transmission spectroscopy metric of similar to 150 combined with a relatively cool equilibrium temperature of T-eq = 582 +/- 16 K and an inactive host star, TOI-3785 b is one of the more promising low-density M-dwarf Neptune targets for atmospheric follow up. Future investigation into atmospheric mass-loss rates of TOI-3785 b may yield new insights into the atmospheric evolution of these low-mass gas planets around M dwarfs.

引用

页数：13

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arXiv, 2023,

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