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

Luke C. Powers; Jessica Libby-Roberts; Andrea S. J. Lin; Caleb I. Cañas; Shubham Kanodia; Suvrath Mahadevan; Joe P. Ninan; Guđmundur Stefánsson; Arvind F. Gupta; Sinclaire Jones; Henry A. Kobulnicky; Andrew Monson; Brock A. Parker; Tera N. Swaby; Chad F. Bender; William D. Cochran; Leslie Hebb; Andrew J. Metcalf; Paul Robertson; Christian Schwab; John Wisniewski; Jason T. Wright

doi:10.3847/1538-3881/acd8bf

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

Luke C. Powers, Jessica Libby-Roberts, Andrea S. J. Lin, Caleb I. Cañas, Shubham Kanodia, Suvrath Mahadevan, Joe P. Ninan, Guđmundur Stefánsson, Arvind F. Gupta, Sinclaire Jones, Henry A. Kobulnicky, Andrew Monson, Brock A. Parker, Tera N. Swaby, Chad F. Bender, William D. Cochran, Leslie Hebb, Andrew J. Metcalf, Paul Robertson, Christian SchwabJohn Wisniewski, Jason T. Wright

School of Mathematical and Physical Sciences

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Abstract

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 ∼4.67 days, a planetary radius of 5.14 ± 0.16 R_⊕, a mass of 14.95_−3.92^+4.10M_⊕, and a density of ρ = 0.61 − 0.17 + 0.18 g cm⁻³. TOI-3785 b belongs to a rare population of Neptunes (4 R_⊕ < R_p < 7 R_⊕) orbiting cooler, smaller M-dwarf host stars, of which only ∼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 ∼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.

Original language	English
Article number	44
Pages (from-to)	1-13
Number of pages	13
Journal	Astronomical Journal
Volume	166
Issue number	2
DOIs	https://doi.org/10.3847/1538-3881/acd8bf
Publication status	Published - 1 Aug 2023

Bibliographical note

© 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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Powers, L. C., Libby-Roberts, J., Lin, A. S. J., Cañas, C. I., Kanodia, S., Mahadevan, S., Ninan, J. P., Stefánsson, G., Gupta, A. F., Jones, S., Kobulnicky, H. A., Monson, A., Parker, B. A., Swaby, T. N., Bender, C. F., Cochran, W. D., Hebb, L., Metcalf, A. J., Robertson, P., ... Wright, J. T. (2023). TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star. Astronomical Journal, 166(2), 1-13. Article 44. https://doi.org/10.3847/1538-3881/acd8bf

@article{ea5e3f0056b5403dae00c5246c5f9a6c,

title = "TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star",

abstract = "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 ∼4.67 days, a planetary radius of 5.14 ± 0.16 R⊕, a mass of 14.95−3.92+4.10M⊕, and a density of ρ = 0.61 − 0.17 + 0.18 g cm−3. TOI-3785 b belongs to a rare population of Neptunes (4 R⊕ < Rp < 7 R⊕) orbiting cooler, smaller M-dwarf host stars, of which only ∼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 ∼150 combined with a relatively cool equilibrium temperature of Teq = 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.",

author = "Powers, \{Luke C.\} and Jessica Libby-Roberts and Lin, \{Andrea S. J.\} and Ca{\~n}as, \{Caleb I.\} and Shubham Kanodia and Suvrath Mahadevan and Ninan, \{Joe P.\} and Gu{\d}mundur Stef{\'a}nsson and Gupta, \{Arvind F.\} and Sinclaire Jones and Kobulnicky, \{Henry A.\} and Andrew Monson and Parker, \{Brock A.\} and Swaby, \{Tera N.\} and Bender, \{Chad F.\} and Cochran, \{William D.\} and Leslie Hebb and Metcalf, \{Andrew J.\} and Paul Robertson and Christian Schwab and John Wisniewski and Wright, \{Jason T.\}",

note = "{\textcopyright} 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2023",

month = aug,

day = "1",

doi = "10.3847/1538-3881/acd8bf",

language = "English",

volume = "166",

pages = "1--13",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

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Powers, LC, Libby-Roberts, J, Lin, ASJ, Cañas, CI, Kanodia, S, Mahadevan, S, Ninan, JP, Stefánsson, G, Gupta, AF, Jones, S, Kobulnicky, HA, Monson, A, Parker, BA, Swaby, TN, Bender, CF, Cochran, WD, Hebb, L, Metcalf, AJ, Robertson, P, Schwab, C, Wisniewski, J & Wright, JT 2023, 'TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star', Astronomical Journal, vol. 166, no. 2, 44, pp. 1-13. https://doi.org/10.3847/1538-3881/acd8bf

TY - JOUR

T1 - TOI-3785 b

T2 - A Low-density Neptune Orbiting an M2-dwarf Star

AU - Powers, Luke C.

AU - Libby-Roberts, Jessica

AU - Lin, Andrea S. J.

AU - Cañas, Caleb I.

AU - Kanodia, Shubham

AU - Mahadevan, Suvrath

AU - Ninan, Joe P.

AU - Stefánsson, Guđmundur

AU - Gupta, Arvind F.

AU - Jones, Sinclaire

AU - Kobulnicky, Henry A.

AU - Monson, Andrew

AU - Parker, Brock A.

AU - Swaby, Tera N.

AU - Bender, Chad F.

AU - Cochran, William D.

AU - Hebb, Leslie

AU - Metcalf, Andrew J.

AU - Robertson, Paul

AU - Schwab, Christian

AU - Wisniewski, John

AU - Wright, Jason T.

N1 - © 2023. The Author(s). Published by the American Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2023/8/1

Y1 - 2023/8/1

N2 - 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 ∼4.67 days, a planetary radius of 5.14 ± 0.16 R⊕, a mass of 14.95−3.92+4.10M⊕, and a density of ρ = 0.61 − 0.17 + 0.18 g cm−3. TOI-3785 b belongs to a rare population of Neptunes (4 R⊕ < Rp < 7 R⊕) orbiting cooler, smaller M-dwarf host stars, of which only ∼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 ∼150 combined with a relatively cool equilibrium temperature of Teq = 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.

AB - 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 ∼4.67 days, a planetary radius of 5.14 ± 0.16 R⊕, a mass of 14.95−3.92+4.10M⊕, and a density of ρ = 0.61 − 0.17 + 0.18 g cm−3. TOI-3785 b belongs to a rare population of Neptunes (4 R⊕ < Rp < 7 R⊕) orbiting cooler, smaller M-dwarf host stars, of which only ∼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 ∼150 combined with a relatively cool equilibrium temperature of Teq = 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.

UR - https://www.scopus.com/pages/publications/85164429125

U2 - 10.3847/1538-3881/acd8bf

DO - 10.3847/1538-3881/acd8bf

M3 - Article

AN - SCOPUS:85164429125

SN - 0004-6256

VL - 166

SP - 1

EP - 13

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - 44

ER -

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

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