A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder

Guðmundur Stefánsson; Ravi Kopparapu; Andrea Lin; Suvrath Mahadevan; Caleb I. Cañas; Shubham Kanodia; Joe P. Ninan; William D. Cochran; Michael Endl; Leslie Hebb; John Wisniewski; Arvind Gupta; Mark Everett; Chad F. Bender; Scott A. Diddams; Eric B. Ford; Connor Fredrick; Samuel Halverson; Fred Hearty; Eric Levi; Marissa Maney; Andrew J. Metcalf; Andrew Monson; Lawrence W. Ramsey; Paul Robertson; Arpita Roy; Christian Schwab; Ryan C. Terrien; Jason T. Wright

doi:10.3847/1538-3881/abbe19

A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder

Guðmundur Stefánsson, Ravi Kopparapu, Andrea Lin, Suvrath Mahadevan, Caleb I. Cañas, Shubham Kanodia, Joe P. Ninan, William D. Cochran, Michael Endl, Leslie Hebb, John Wisniewski, Arvind Gupta, Mark Everett, Chad F. Bender, Scott A. Diddams, Eric B. Ford, Connor Fredrick, Samuel Halverson, Fred Hearty, Eric LeviMarissa Maney, Andrew J. Metcalf, Andrew Monson, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Ryan C. Terrien, Jason T. Wright

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Abstract

We report on the validation of two planets orbiting the nearby (36 pc) M2 dwarf TOI-1266 observed by the TESS mission. This system is one of a few M dwarf multiplanet systems with close-in planets where the inner planet is substantially larger than the outer planet. The inner planet is sub-Neptune-sized (R = 2.46 ± 0.08 R_⊕) with an orbital period of 10.9 days, while the outer planet has a radius of 1.67_-0.11^+0.09 R_⊕ and resides in the exoplanet radius Valley-the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of 15.9 and 6.4 M_⊕ at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of both planets, achievable with current radial velocity instruments given the host star brightness (V = 12.9, J = 9.7), will yield further insights into the dominant processes sculpting the exoplanet radius valley.

Original language	English
Article number	259
Pages (from-to)	1-19
Number of pages	19
Journal	Astronomical Journal
Volume	160
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/abbe19
Publication status	Published - 1 Dec 2020

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Stefánsson, G., Kopparapu, R., Lin, A., Mahadevan, S., Cañas, C. I., Kanodia, S., Ninan, J. P., Cochran, W. D., Endl, M., Hebb, L., Wisniewski, J., Gupta, A., Everett, M., Bender, C. F., Diddams, S. A., Ford, E. B., Fredrick, C., Halverson, S., Hearty, F., ... Wright, J. T. (2020). A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder. Astronomical Journal, 160(6), 1-19. [259]. https://doi.org/10.3847/1538-3881/abbe19

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title = "A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder",

abstract = "We report on the validation of two planets orbiting the nearby (36 pc) M2 dwarf TOI-1266 observed by the TESS mission. This system is one of a few M dwarf multiplanet systems with close-in planets where the inner planet is substantially larger than the outer planet. The inner planet is sub-Neptune-sized (R = 2.46 ± 0.08 R⊕) with an orbital period of 10.9 days, while the outer planet has a radius of 1.67-0.11+0.09 R⊕ and resides in the exoplanet radius Valley-the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of 15.9 and 6.4 M⊕ at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of both planets, achievable with current radial velocity instruments given the host star brightness (V = 12.9, J = 9.7), will yield further insights into the dominant processes sculpting the exoplanet radius valley.",

author = "Gu{\dh}mundur Stef{\'a}nsson and Ravi Kopparapu and Andrea Lin and Suvrath Mahadevan and Ca{\~n}as, {Caleb I.} and Shubham Kanodia and Ninan, {Joe P.} and Cochran, {William D.} and Michael Endl and Leslie Hebb and John Wisniewski and Arvind Gupta and Mark Everett and Bender, {Chad F.} and Diddams, {Scott A.} and Ford, {Eric B.} and Connor Fredrick and Samuel Halverson and Fred Hearty and Eric Levi and Marissa Maney and Metcalf, {Andrew J.} and Andrew Monson and Ramsey, {Lawrence W.} and Paul Robertson and Arpita Roy and Christian Schwab and Terrien, {Ryan C.} and Wright, {Jason T.}",

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doi = "10.3847/1538-3881/abbe19",

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Stefánsson, G, Kopparapu, R, Lin, A, Mahadevan, S, Cañas, CI, Kanodia, S, Ninan, JP, Cochran, WD, Endl, M, Hebb, L, Wisniewski, J, Gupta, A, Everett, M, Bender, CF, Diddams, SA, Ford, EB, Fredrick, C, Halverson, S, Hearty, F, Levi, E, Maney, M, Metcalf, AJ, Monson, A, Ramsey, LW, Robertson, P, Roy, A, Schwab, C, Terrien, RC & Wright, JT 2020, 'A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder', Astronomical Journal, vol. 160, no. 6, 259, pp. 1-19. https://doi.org/10.3847/1538-3881/abbe19

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T1 - A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone

T2 - Validation with the Habitable-zone Planet Finder

AU - Stefánsson, Guðmundur

AU - Kopparapu, Ravi

AU - Lin, Andrea

AU - Mahadevan, Suvrath

AU - Cañas, Caleb I.

AU - Kanodia, Shubham

AU - Ninan, Joe P.

AU - Cochran, William D.

AU - Endl, Michael

AU - Hebb, Leslie

AU - Wisniewski, John

AU - Gupta, Arvind

AU - Everett, Mark

AU - Bender, Chad F.

AU - Diddams, Scott A.

AU - Ford, Eric B.

AU - Fredrick, Connor

AU - Halverson, Samuel

AU - Hearty, Fred

AU - Levi, Eric

AU - Maney, Marissa

AU - Metcalf, Andrew J.

AU - Monson, Andrew

AU - Ramsey, Lawrence W.

AU - Robertson, Paul

AU - Roy, Arpita

AU - Schwab, Christian

AU - Terrien, Ryan C.

AU - Wright, Jason T.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - We report on the validation of two planets orbiting the nearby (36 pc) M2 dwarf TOI-1266 observed by the TESS mission. This system is one of a few M dwarf multiplanet systems with close-in planets where the inner planet is substantially larger than the outer planet. The inner planet is sub-Neptune-sized (R = 2.46 ± 0.08 R⊕) with an orbital period of 10.9 days, while the outer planet has a radius of 1.67-0.11+0.09 R⊕ and resides in the exoplanet radius Valley-the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of 15.9 and 6.4 M⊕ at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of both planets, achievable with current radial velocity instruments given the host star brightness (V = 12.9, J = 9.7), will yield further insights into the dominant processes sculpting the exoplanet radius valley.

AB - We report on the validation of two planets orbiting the nearby (36 pc) M2 dwarf TOI-1266 observed by the TESS mission. This system is one of a few M dwarf multiplanet systems with close-in planets where the inner planet is substantially larger than the outer planet. The inner planet is sub-Neptune-sized (R = 2.46 ± 0.08 R⊕) with an orbital period of 10.9 days, while the outer planet has a radius of 1.67-0.11+0.09 R⊕ and resides in the exoplanet radius Valley-the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of 15.9 and 6.4 M⊕ at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of both planets, achievable with current radial velocity instruments given the host star brightness (V = 12.9, J = 9.7), will yield further insights into the dominant processes sculpting the exoplanet radius valley.

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A Mini-Neptune and a radius valley planet orbiting the nearby M2 dwarf TOI-1266 in its Venus zone: Validation with the Habitable-zone Planet Finder

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