Two temperate sub-Neptunes transiting the star EPIC 212737443

Mahesh Herath; Tobias C. Hinse; John H. Livingston; Jesús Hernández; Daniel F. Evans; Robert Wells; Saraj Gunesekera; Jeremy Tregloan-Reed; Markus Rabus; Jesper Skottfelt; Martin Dominik; Uffe G. Jørgensen; Chandana Jayaratne; Cuc T. K. Lý

doi:10.1093/mnras/stz1641

Two temperate sub-Neptunes transiting the star EPIC 212737443

Mahesh Herath, Tobias C. Hinse, John H. Livingston, Jesús Hernández, Daniel F. Evans, Robert Wells, Saraj Gunesekera, Jeremy Tregloan-Reed, Markus Rabus, Jesper Skottfelt, Martin Dominik, Uffe G. Jørgensen, Chandana Jayaratne, Cuc T. K. Lý

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Abstract

We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temperatures of 536 and 316 K, respectively. In the context of validated K2 systems, the outer planet has the longest precisely measured orbital period, as well as the lowest equilibrium temperature for a planet orbiting a star of spectral type earlier than M. The two planets in this system have a mutual Hill radius of ΔRH = 36, larger than most other known transiting multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.

Original language	English
Pages (from-to)	536–546
Journal	Monthly Notices of the Royal Astronomical Society
Volume	488
Issue number	1
Early online date	14 Jun 2019
DOIs	https://doi.org/10.1093/mnras/stz1641
Publication status	Published - Sept 2019

Keywords

Techniques: photometric
Techniques: spectroscopic
eclipses
Planets and satellites: detection

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10.1093/mnras/stz1641

stz1641
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stz1641
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Herath, M., Hinse, T. C., Livingston, J. H., Hernández, J., Evans, D. F., Wells, R., Gunesekera, S., Tregloan-Reed, J., Rabus, M., Skottfelt, J., Dominik, M., Jørgensen, U. G., Jayaratne, C., & Lý, C. T. K. (2019). Two temperate sub-Neptunes transiting the star EPIC 212737443. Monthly Notices of the Royal Astronomical Society, 488(1), 536–546. https://doi.org/10.1093/mnras/stz1641

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title = "Two temperate sub-Neptunes transiting the star EPIC 212737443",

abstract = "We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temperatures of 536 and 316 K, respectively. In the context of validated K2 systems, the outer planet has the longest precisely measured orbital period, as well as the lowest equilibrium temperature for a planet orbiting a star of spectral type earlier than M. The two planets in this system have a mutual Hill radius of ΔRH = 36, larger than most other known transiting multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.",

keywords = "Techniques: photometric, Techniques: spectroscopic, eclipses, Planets and satellites: detection",

author = "Mahesh Herath and Hinse, \{Tobias C.\} and Livingston, \{John H.\} and Jes{\'u}s Hern{\'a}ndez and Evans, \{Daniel F.\} and Robert Wells and Saraj Gunesekera and Jeremy Tregloan-Reed and Markus Rabus and Jesper Skottfelt and Martin Dominik and J{\o}rgensen, \{Uffe G.\} and Chandana Jayaratne and L{\'y}, \{Cuc T. K.\}",

year = "2019",

month = sep,

doi = "10.1093/mnras/stz1641",

language = "English",

volume = "488",

pages = "536–546",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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Herath, M, Hinse, TC, Livingston, JH, Hernández, J, Evans, DF, Wells, R, Gunesekera, S, Tregloan-Reed, J, Rabus, M, Skottfelt, J, Dominik, M, Jørgensen, UG, Jayaratne, C & Lý, CTK 2019, 'Two temperate sub-Neptunes transiting the star EPIC 212737443', Monthly Notices of the Royal Astronomical Society, vol. 488, no. 1, pp. 536–546. https://doi.org/10.1093/mnras/stz1641

TY - JOUR

T1 - Two temperate sub-Neptunes transiting the star EPIC 212737443

AU - Herath, Mahesh

AU - Hinse, Tobias C.

AU - Livingston, John H.

AU - Hernández, Jesús

AU - Evans, Daniel F.

AU - Wells, Robert

AU - Gunesekera, Saraj

AU - Tregloan-Reed, Jeremy

AU - Rabus, Markus

AU - Skottfelt, Jesper

AU - Dominik, Martin

AU - Jørgensen, Uffe G.

AU - Jayaratne, Chandana

AU - Lý, Cuc T. K.

PY - 2019/9

Y1 - 2019/9

N2 - We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temperatures of 536 and 316 K, respectively. In the context of validated K2 systems, the outer planet has the longest precisely measured orbital period, as well as the lowest equilibrium temperature for a planet orbiting a star of spectral type earlier than M. The two planets in this system have a mutual Hill radius of ΔRH = 36, larger than most other known transiting multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.

AB - We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temperatures of 536 and 316 K, respectively. In the context of validated K2 systems, the outer planet has the longest precisely measured orbital period, as well as the lowest equilibrium temperature for a planet orbiting a star of spectral type earlier than M. The two planets in this system have a mutual Hill radius of ΔRH = 36, larger than most other known transiting multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.

KW - Techniques: photometric

KW - Techniques: spectroscopic

KW - eclipses

KW - Planets and satellites: detection

UR - https://www.scopus.com/pages/publications/85078461992

U2 - 10.1093/mnras/stz1641

DO - 10.1093/mnras/stz1641

M3 - Article

SN - 0035-8711

VL - 488

SP - 536

EP - 546

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Two temperate sub-Neptunes transiting the star EPIC 212737443

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Keywords

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