K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths

Teruyuki Hirano; Fei Dai; John H. Livingston; Yuka Fujii; William D. Cochran; Michael Endl; Davide Gandolfi; Seth Redfield; Joshua N. Winn; Eike W. Guenther; Jorge Prieto-Arranz; Simon Albrecht; Oscar Barragan; Juan Cabrera; P. Wilson Cauley; Szilard Csizmadia; Hans Deeg; Philipp Eigmüller; Anders Erikson; Malcolm Fridlund; Akihiko Fukui; Sascha Grziwa; Artie P. Hatzes; Judith Korth; Norio Narita; David Nespral; Prajwal Niraula; Grzegorz Nowak; Martin Pätzold; Enric Palle; Carina M. Persson; Heike Rauer; Ignasi Ribas; Alexis M.S. Smith; Vincent Van Eylen

doi:10.3847/1538-3881/aaaa6e

K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths

Teruyuki Hirano, Fei Dai, John H. Livingston, Yuka Fujii, William D. Cochran, Michael Endl, Davide Gandolfi, Seth Redfield, Joshua N. Winn, Eike W. Guenther, Jorge Prieto-Arranz, Simon Albrecht, Oscar Barragan, Juan Cabrera, P. Wilson Cauley, Szilard Csizmadia, Hans Deeg, Philipp Eigmüller, Anders Erikson, Malcolm FridlundAkihiko Fukui, Sascha Grziwa, Artie P. Hatzes, Judith Korth, Norio Narita, David Nespral, Prajwal Niraula, Grzegorz Nowak, Martin Pätzold, Enric Palle, Carina M. Persson, Heike Rauer, Ignasi Ribas, Alexis M.S. Smith, Vincent Van Eylen

Astrophysical Sciences

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Abstract

We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf (V = 12.81 mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, we conducted speckle imaging and high-dispersion optical spectroscopy, including radial velocity measurements. Based on the K2 light curve and the spectroscopic characterization of the host star, the planet sizes and orbital periods are 1.55_-0.17^+0.20R_⊕ and 6.34365 ±0.00028 days for the inner planet; 1.95_-0.22^+0.27R_⊕ and 13.85402 ±0.00088 days for the middle planet; and 1.64_-0.17^+0.18 R_⊕ and 40.6835 ±0.0031 days for the outer planet. The outer planet (K2-155d) is near the habitable zone, with an insolation 1.67 ±0.38 times that of the Earth. The planet's radius falls within the range between that of smaller rocky planets and larger gas-rich planets. To assess the habitability of this planet, we present a series of three-dimensional global climate simulations, assuming that K2-155d is tidally locked and has an Earth-like composition and atmosphere. We find that the planet can maintain a moderate surface temperature if the insolation proves to be smaller than ∼1.5 times that of the Earth. Doppler mass measurements, transit spectroscopy, and other follow-up observations should be rewarding, as K2-155 is one of the optically brightest M dwarfs known to harbor transiting planets.

Original language	English (US)
Article number	124
Journal	Astronomical Journal
Volume	155
Issue number	3
DOIs	https://doi.org/10.3847/1538-3881/aaaa6e
State	Published - Mar 2018

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets and satellites: detection
stars: individual (K2-155 = EPIC 210897587)
techniques: photometric
techniques: radial velocities
techniques: spectroscopic

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Hirano, T., Dai, F., Livingston, J. H., Fujii, Y., Cochran, W. D., Endl, M., Gandolfi, D., Redfield, S., Winn, J. N., Guenther, E. W., Prieto-Arranz, J., Albrecht, S., Barragan, O., Cabrera, J., Cauley, P. W., Csizmadia, S., Deeg, H., Eigmüller, P., Erikson, A., ... Eylen, V. V. (2018). K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths. Astronomical Journal, 155(3), Article 124. https://doi.org/10.3847/1538-3881/aaaa6e

@article{3e465022be0b4b44ba541a12ccb231ce,

title = "K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths",

abstract = "We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf (V = 12.81 mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, we conducted speckle imaging and high-dispersion optical spectroscopy, including radial velocity measurements. Based on the K2 light curve and the spectroscopic characterization of the host star, the planet sizes and orbital periods are 1.55-0.17+0.20R⊕ and 6.34365 ±0.00028 days for the inner planet; 1.95-0.22+0.27R⊕ and 13.85402 ±0.00088 days for the middle planet; and 1.64-0.17+0.18 R⊕ and 40.6835 ±0.0031 days for the outer planet. The outer planet (K2-155d) is near the habitable zone, with an insolation 1.67 ±0.38 times that of the Earth. The planet's radius falls within the range between that of smaller rocky planets and larger gas-rich planets. To assess the habitability of this planet, we present a series of three-dimensional global climate simulations, assuming that K2-155d is tidally locked and has an Earth-like composition and atmosphere. We find that the planet can maintain a moderate surface temperature if the insolation proves to be smaller than ∼1.5 times that of the Earth. Doppler mass measurements, transit spectroscopy, and other follow-up observations should be rewarding, as K2-155 is one of the optically brightest M dwarfs known to harbor transiting planets.",

keywords = "planets and satellites: detection, stars: individual (K2-155 = EPIC 210897587), techniques: photometric, techniques: radial velocities, techniques: spectroscopic",

author = "Teruyuki Hirano and Fei Dai and Livingston, {John H.} and Yuka Fujii and Cochran, {William D.} and Michael Endl and Davide Gandolfi and Seth Redfield and Winn, {Joshua N.} and Guenther, {Eike W.} and Jorge Prieto-Arranz and Simon Albrecht and Oscar Barragan and Juan Cabrera and Cauley, {P. Wilson} and Szilard Csizmadia and Hans Deeg and Philipp Eigm{\"u}ller and Anders Erikson and Malcolm Fridlund and Akihiko Fukui and Sascha Grziwa and Hatzes, {Artie P.} and Judith Korth and Norio Narita and David Nespral and Prajwal Niraula and Grzegorz Nowak and Martin P{\"a}tzold and Enric Palle and Persson, {Carina M.} and Heike Rauer and Ignasi Ribas and Smith, {Alexis M.S.} and Eylen, {Vincent Van}",

year = "2018",

month = mar,

doi = "10.3847/1538-3881/aaaa6e",

language = "English (US)",

volume = "155",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "3",

}

Hirano, T, Dai, F, Livingston, JH, Fujii, Y, Cochran, WD, Endl, M, Gandolfi, D, Redfield, S, Winn, JN, Guenther, EW, Prieto-Arranz, J, Albrecht, S, Barragan, O, Cabrera, J, Cauley, PW, Csizmadia, S, Deeg, H, Eigmüller, P, Erikson, A, Fridlund, M, Fukui, A, Grziwa, S, Hatzes, AP, Korth, J, Narita, N, Nespral, D, Niraula, P, Nowak, G, Pätzold, M, Palle, E, Persson, CM, Rauer, H, Ribas, I, Smith, AMS & Eylen, VV 2018, 'K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths', Astronomical Journal, vol. 155, no. 3, 124. https://doi.org/10.3847/1538-3881/aaaa6e

TY - JOUR

T1 - K2-155

T2 - A Bright Metal-poor M Dwarf with Three Transiting Super-Earths

AU - Hirano, Teruyuki

AU - Dai, Fei

AU - Livingston, John H.

AU - Fujii, Yuka

AU - Cochran, William D.

AU - Endl, Michael

AU - Gandolfi, Davide

AU - Redfield, Seth

AU - Winn, Joshua N.

AU - Guenther, Eike W.

AU - Prieto-Arranz, Jorge

AU - Albrecht, Simon

AU - Barragan, Oscar

AU - Cabrera, Juan

AU - Cauley, P. Wilson

AU - Csizmadia, Szilard

AU - Deeg, Hans

AU - Eigmüller, Philipp

AU - Erikson, Anders

AU - Fridlund, Malcolm

AU - Fukui, Akihiko

AU - Grziwa, Sascha

AU - Hatzes, Artie P.

AU - Korth, Judith

AU - Narita, Norio

AU - Nespral, David

AU - Niraula, Prajwal

AU - Nowak, Grzegorz

AU - Pätzold, Martin

AU - Palle, Enric

AU - Persson, Carina M.

AU - Rauer, Heike

AU - Ribas, Ignasi

AU - Smith, Alexis M.S.

AU - Eylen, Vincent Van

PY - 2018/3

Y1 - 2018/3

N2 - We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf (V = 12.81 mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, we conducted speckle imaging and high-dispersion optical spectroscopy, including radial velocity measurements. Based on the K2 light curve and the spectroscopic characterization of the host star, the planet sizes and orbital periods are 1.55-0.17+0.20R⊕ and 6.34365 ±0.00028 days for the inner planet; 1.95-0.22+0.27R⊕ and 13.85402 ±0.00088 days for the middle planet; and 1.64-0.17+0.18 R⊕ and 40.6835 ±0.0031 days for the outer planet. The outer planet (K2-155d) is near the habitable zone, with an insolation 1.67 ±0.38 times that of the Earth. The planet's radius falls within the range between that of smaller rocky planets and larger gas-rich planets. To assess the habitability of this planet, we present a series of three-dimensional global climate simulations, assuming that K2-155d is tidally locked and has an Earth-like composition and atmosphere. We find that the planet can maintain a moderate surface temperature if the insolation proves to be smaller than ∼1.5 times that of the Earth. Doppler mass measurements, transit spectroscopy, and other follow-up observations should be rewarding, as K2-155 is one of the optically brightest M dwarfs known to harbor transiting planets.

AB - We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf (V = 12.81 mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, we conducted speckle imaging and high-dispersion optical spectroscopy, including radial velocity measurements. Based on the K2 light curve and the spectroscopic characterization of the host star, the planet sizes and orbital periods are 1.55-0.17+0.20R⊕ and 6.34365 ±0.00028 days for the inner planet; 1.95-0.22+0.27R⊕ and 13.85402 ±0.00088 days for the middle planet; and 1.64-0.17+0.18 R⊕ and 40.6835 ±0.0031 days for the outer planet. The outer planet (K2-155d) is near the habitable zone, with an insolation 1.67 ±0.38 times that of the Earth. The planet's radius falls within the range between that of smaller rocky planets and larger gas-rich planets. To assess the habitability of this planet, we present a series of three-dimensional global climate simulations, assuming that K2-155d is tidally locked and has an Earth-like composition and atmosphere. We find that the planet can maintain a moderate surface temperature if the insolation proves to be smaller than ∼1.5 times that of the Earth. Doppler mass measurements, transit spectroscopy, and other follow-up observations should be rewarding, as K2-155 is one of the optically brightest M dwarfs known to harbor transiting planets.

KW - planets and satellites: detection

KW - stars: individual (K2-155 = EPIC 210897587)

KW - techniques: photometric

KW - techniques: radial velocities

KW - techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=85043605959&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85043605959&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aaaa6e

DO - 10.3847/1538-3881/aaaa6e

M3 - Article

AN - SCOPUS:85043605959

SN - 0004-6256

VL - 155

JO - Astronomical Journal

JF - Astronomical Journal

IS - 3

M1 - 124

ER -

K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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