A Hot Mars-sized Exoplanet Transiting an M Dwarf

Caleb I. Caas; Suvrath Mahadevan; William D. Cochran; Chad F. Bender; Eric D. Feigelson; C. E. Harman; Ravi Kumar Kopparapu; Gabriel A. Caceres; Scott A. Diddams; Michael Endl; Eric B. Ford; Samuel Halverson; Fred Hearty; Sinclaire Jones; Shubham Kanodia; Andrea S.J. Lin; Andrew J. Metcalf; Andrew Monson; Joe P. Ninan; Lawrence W. Ramsey; Paul Robertson; Arpita Roy; Christian Schwab; Guđmundur Stefánsson

doi:10.3847/1538-3881/ac3088

A Hot Mars-sized Exoplanet Transiting an M Dwarf

Caleb I. Caas
, Suvrath Mahadevan
, William D. Cochran
, Chad F. Bender
, Eric D. Feigelson
, C. E. Harman
, Ravi Kumar Kopparapu
, Gabriel A. Caceres
, Scott A. Diddams
, Michael Endl
, Eric B. Ford
, Samuel Halverson
, Fred Hearty
, Sinclaire Jones
, Shubham Kanodia
, Andrea S.J. Lin
, Andrew J. Metcalf
, Andrew Monson
, Joe P. Ninan
, Lawrence W. Ramsey

Paul Robertson, Arpita Roy, Christian Schwab, Guđmundur Stefánsson

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R p = 0.51 0.03R ⊕) orbiting the host star every 0.412 days (∼9.9 hr). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper 3σ mass to M p < 0.34 M ⊕ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.

Original language	English (US)
Article number	3
Journal	Astronomical Journal
Volume	163
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/ac3088
State	Published - Jan 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ac3088

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Caas, C. I., Mahadevan, S., Cochran, W. D., Bender, C. F., Feigelson, E. D., Harman, C. E., Kopparapu, R. K., Caceres, G. A., Diddams, S. A., Endl, M., Ford, E. B., Halverson, S., Hearty, F., Jones, S., Kanodia, S., Lin, A. S. J., Metcalf, A. J., Monson, A., Ninan, J. P., ... Stefánsson, G. (2022). A Hot Mars-sized Exoplanet Transiting an M Dwarf. Astronomical Journal, 163(1), Article 3. https://doi.org/10.3847/1538-3881/ac3088

@article{b85a129feacd44b7b1bacb82ef783159,

title = "A Hot Mars-sized Exoplanet Transiting an M Dwarf",

abstract = "We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R p = 0.51 0.03R ⊕) orbiting the host star every 0.412 days (∼9.9 hr). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper 3σ mass to M p < 0.34 M ⊕ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.",

author = "Caas, \{Caleb I.\} and Suvrath Mahadevan and Cochran, \{William D.\} and Bender, \{Chad F.\} and Feigelson, \{Eric D.\} and Harman, \{C. E.\} and Kopparapu, \{Ravi Kumar\} and Caceres, \{Gabriel A.\} and Diddams, \{Scott A.\} and Michael Endl and Ford, \{Eric B.\} and Samuel Halverson and Fred Hearty and Sinclaire Jones and Shubham Kanodia and Lin, \{Andrea S.J.\} and Metcalf, \{Andrew J.\} and Andrew Monson and Ninan, \{Joe P.\} and Ramsey, \{Lawrence W.\} and Paul Robertson and Arpita Roy and Christian Schwab and Gu{\d}mundur Stef{\'a}nsson",

note = "Publisher Copyright: {\textcopyright} 2021. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = jan,

day = "1",

doi = "10.3847/1538-3881/ac3088",

language = "English (US)",

volume = "163",

journal = "Astronomical Journal",

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Caas, CI, Mahadevan, S, Cochran, WD, Bender, CF, Feigelson, ED, Harman, CE, Kopparapu, RK, Caceres, GA, Diddams, SA, Endl, M, Ford, EB, Halverson, S, Hearty, F, Jones, S, Kanodia, S, Lin, ASJ, Metcalf, AJ, Monson, A, Ninan, JP, Ramsey, LW, Robertson, P, Roy, A, Schwab, C & Stefánsson, G 2022, 'A Hot Mars-sized Exoplanet Transiting an M Dwarf', Astronomical Journal, vol. 163, no. 1, 3. https://doi.org/10.3847/1538-3881/ac3088

TY - JOUR

T1 - A Hot Mars-sized Exoplanet Transiting an M Dwarf

AU - Caas, Caleb I.

AU - Mahadevan, Suvrath

AU - Cochran, William D.

AU - Bender, Chad F.

AU - Feigelson, Eric D.

AU - Harman, C. E.

AU - Kopparapu, Ravi Kumar

AU - Caceres, Gabriel A.

AU - Diddams, Scott A.

AU - Endl, Michael

AU - Ford, Eric B.

AU - Halverson, Samuel

AU - Hearty, Fred

AU - Jones, Sinclaire

AU - Kanodia, Shubham

AU - Lin, Andrea S.J.

AU - Metcalf, Andrew J.

AU - Monson, Andrew

AU - Ninan, Joe P.

AU - Ramsey, Lawrence W.

AU - Robertson, Paul

AU - Roy, Arpita

AU - Schwab, Christian

AU - Stefánsson, Guđmundur

PY - 2022/1/1

Y1 - 2022/1/1

N2 - We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R p = 0.51 0.03R ⊕) orbiting the host star every 0.412 days (∼9.9 hr). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper 3σ mass to M p < 0.34 M ⊕ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.

AB - We validate the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet (R p = 0.51 0.03R ⊕) orbiting the host star every 0.412 days (∼9.9 hr). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper 3σ mass to M p < 0.34 M ⊕ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.

UR - https://www.scopus.com/pages/publications/85122618043

UR - https://www.scopus.com/pages/publications/85122618043#tab=citedBy

U2 - 10.3847/1538-3881/ac3088

DO - 10.3847/1538-3881/ac3088

M3 - Article

AN - SCOPUS:85122618043

SN - 0004-6256

VL - 163

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1

M1 - 3

ER -

A Hot Mars-sized Exoplanet Transiting an M Dwarf

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All Science Journal Classification (ASJC) codes

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