K2-280 b-a low density warm sub-Saturn around a mildly evolved star

Grzegorz Nowak; Enric Palle; Davide Gandolfi; Hans J. Deeg; Teruyuki Hirano; Oscar Barragán; Masayuki Kuzuhara; Fei Dai; Rafael Luque; Carina M. Persson; Malcolm Fridlund; Marshall C. Johnson; Judith Korth; John H. Livingston; Sascha Grziwa; Savita Mathur; Artie P. Hatzes; Jorge Prieto-Arranz; David Nespral; Diego Hidalgo; Maria Hjorth; Simon Albrecht; Vincent Van Eylen; Kristine W.F. Lam; William D. Cochran; Massimiliano Esposito; Szilárd Csizmadia; Eike W. Guenther; Petr Kabath; Pere Blay; Rafael Brahm; Andrés Jordán; Néstor Espinoza; Felipe Rojas; Núria Casasayas Barris; Florian Rodler; Roi Alonso Sobrino; Juan Cabrera; Ilaria Carleo; Alexander Chaushev; Jerome De Leon; Philipp Eigmüller; Michael Endl; Anders Erikson; Akihiko Fukui; Iskra Georgieva; Lucía González-Cuesta; Emil Knudstrup; Mikkel N. Lund; Pilar Montañes Rodríguez; Felipe Murgas; Norio Narita; Prajwal Niraula; Martin Pätzold; Heike Rauer; Seth Redfield; Ignasi Ribas; Marek Skarka; Alexis M.S. Smith; Jano Subjak

doi:10.1093/mnras/staa2077

K2-280 b-a low density warm sub-Saturn around a mildly evolved star

Grzegorz Nowak, Enric Palle, Davide Gandolfi, Hans J. Deeg, Teruyuki Hirano, Oscar Barragán, Masayuki Kuzuhara, Fei Dai, Rafael Luque, Carina M. Persson, Malcolm Fridlund, Marshall C. Johnson, Judith Korth, John H. Livingston, Sascha Grziwa, Savita Mathur, Artie P. Hatzes, Jorge Prieto-Arranz, David Nespral, Diego HidalgoMaria Hjorth, Simon Albrecht, Vincent Van Eylen, Kristine W.F. Lam, William D. Cochran, Massimiliano Esposito, Szilárd Csizmadia, Eike W. Guenther, Petr Kabath, Pere Blay, Rafael Brahm, Andrés Jordán, Néstor Espinoza, Felipe Rojas, Núria Casasayas Barris, Florian Rodler, Roi Alonso Sobrino, Juan Cabrera, Ilaria Carleo, Alexander Chaushev, Jerome De Leon, Philipp Eigmüller, Michael Endl, Anders Erikson, Akihiko Fukui, Iskra Georgieva, Lucía González-Cuesta, Emil Knudstrup, Mikkel N. Lund, Pilar Montañes Rodríguez, Felipe Murgas, Norio Narita, Prajwal Niraula, Martin Pätzold, Heike Rauer, Seth Redfield, Ignasi Ribas, Marek Skarka, Alexis M.S. Smith, Jano Subjak

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Abstract

We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

Original language	English
Pages (from-to)	4423-4435
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	497
Issue number	4
DOIs	https://doi.org/10.1093/mnras/staa2077
State	Published - 1 Oct 2020
Externally published	Yes

Keywords

K2-280)
planets and satellites: detection
stars: individual: (EPIC 216494238
techniques: photometric
techniques: radial velocities
techniques: spectroscopic

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10.1093/mnras/staa2077

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Nowak, G., Palle, E., Gandolfi, D., Deeg, H. J., Hirano, T., Barragán, O., Kuzuhara, M., Dai, F., Luque, R., Persson, C. M., Fridlund, M., Johnson, M. C., Korth, J., Livingston, J. H., Grziwa, S., Mathur, S., Hatzes, A. P., Prieto-Arranz, J., Nespral, D., ... Subjak, J. (2020). K2-280 b-a low density warm sub-Saturn around a mildly evolved star. Monthly Notices of the Royal Astronomical Society, 497(4), 4423-4435. https://doi.org/10.1093/mnras/staa2077

@article{a66865b7daca4f99b2ab209a53297529,

title = "K2-280 b-a low density warm sub-Saturn around a mildly evolved star",

abstract = "We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.",

keywords = "K2-280), planets and satellites: detection, stars: individual: (EPIC 216494238, techniques: photometric, techniques: radial velocities, techniques: spectroscopic",

author = "Grzegorz Nowak and Enric Palle and Davide Gandolfi and Deeg, {Hans J.} and Teruyuki Hirano and Oscar Barrag{\'a}n and Masayuki Kuzuhara and Fei Dai and Rafael Luque and Persson, {Carina M.} and Malcolm Fridlund and Johnson, {Marshall C.} and Judith Korth and Livingston, {John H.} and Sascha Grziwa and Savita Mathur and Hatzes, {Artie P.} and Jorge Prieto-Arranz and David Nespral and Diego Hidalgo and Maria Hjorth and Simon Albrecht and {Van Eylen}, Vincent and Lam, {Kristine W.F.} and Cochran, {William D.} and Massimiliano Esposito and Szil{\'a}rd Csizmadia and Guenther, {Eike W.} and Petr Kabath and Pere Blay and Rafael Brahm and Andr{\'e}s Jord{\'a}n and N{\'e}stor Espinoza and Felipe Rojas and {Casasayas Barris}, N{\'u}ria and Florian Rodler and {Alonso Sobrino}, Roi and Juan Cabrera and Ilaria Carleo and Alexander Chaushev and {De Leon}, Jerome and Philipp Eigm{\"u}ller and Michael Endl and Anders Erikson and Akihiko Fukui and Iskra Georgieva and Luc{\'i}a Gonz{\'a}lez-Cuesta and Emil Knudstrup and Lund, {Mikkel N.} and {Monta{\~n}es Rodr{\'i}guez}, Pilar and Felipe Murgas and Norio Narita and Prajwal Niraula and Martin P{\"a}tzold and Heike Rauer and Seth Redfield and Ignasi Ribas and Marek Skarka and Smith, {Alexis M.S.} and Jano Subjak",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s).",

year = "2020",

month = oct,

day = "1",

doi = "10.1093/mnras/staa2077",

language = "English",

volume = "497",

pages = "4423--4435",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

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Nowak, G, Palle, E, Gandolfi, D, Deeg, HJ, Hirano, T, Barragán, O, Kuzuhara, M, Dai, F, Luque, R, Persson, CM, Fridlund, M, Johnson, MC, Korth, J, Livingston, JH, Grziwa, S, Mathur, S, Hatzes, AP, Prieto-Arranz, J, Nespral, D, Hidalgo, D, Hjorth, M, Albrecht, S, Van Eylen, V, Lam, KWF, Cochran, WD, Esposito, M, Csizmadia, S, Guenther, EW, Kabath, P, Blay, P, Brahm, R , Jordán, A, Espinoza, N, Rojas, F, Casasayas Barris, N, Rodler, F, Alonso Sobrino, R, Cabrera, J, Carleo, I, Chaushev, A, De Leon, J, Eigmüller, P, Endl, M, Erikson, A, Fukui, A, Georgieva, I, González-Cuesta, L, Knudstrup, E, Lund, MN, Montañes Rodríguez, P, Murgas, F, Narita, N, Niraula, P, Pätzold, M, Rauer, H, Redfield, S, Ribas, I, Skarka, M, Smith, AMS & Subjak, J 2020, 'K2-280 b-a low density warm sub-Saturn around a mildly evolved star', Monthly Notices of the Royal Astronomical Society, vol. 497, no. 4, pp. 4423-4435. https://doi.org/10.1093/mnras/staa2077

TY - JOUR

T1 - K2-280 b-a low density warm sub-Saturn around a mildly evolved star

AU - Nowak, Grzegorz

AU - Palle, Enric

AU - Gandolfi, Davide

AU - Deeg, Hans J.

AU - Hirano, Teruyuki

AU - Barragán, Oscar

AU - Kuzuhara, Masayuki

AU - Dai, Fei

AU - Luque, Rafael

AU - Persson, Carina M.

AU - Fridlund, Malcolm

AU - Johnson, Marshall C.

AU - Korth, Judith

AU - Livingston, John H.

AU - Grziwa, Sascha

AU - Mathur, Savita

AU - Hatzes, Artie P.

AU - Prieto-Arranz, Jorge

AU - Nespral, David

AU - Hidalgo, Diego

AU - Hjorth, Maria

AU - Albrecht, Simon

AU - Van Eylen, Vincent

AU - Lam, Kristine W.F.

AU - Cochran, William D.

AU - Esposito, Massimiliano

AU - Csizmadia, Szilárd

AU - Guenther, Eike W.

AU - Kabath, Petr

AU - Blay, Pere

AU - Brahm, Rafael

AU - Jordán, Andrés

AU - Espinoza, Néstor

AU - Rojas, Felipe

AU - Casasayas Barris, Núria

AU - Rodler, Florian

AU - Alonso Sobrino, Roi

AU - Cabrera, Juan

AU - Carleo, Ilaria

AU - Chaushev, Alexander

AU - De Leon, Jerome

AU - Eigmüller, Philipp

AU - Endl, Michael

AU - Erikson, Anders

AU - Fukui, Akihiko

AU - Georgieva, Iskra

AU - González-Cuesta, Lucía

AU - Knudstrup, Emil

AU - Lund, Mikkel N.

AU - Montañes Rodríguez, Pilar

AU - Murgas, Felipe

AU - Narita, Norio

AU - Niraula, Prajwal

AU - Pätzold, Martin

AU - Rauer, Heike

AU - Redfield, Seth

AU - Ribas, Ignasi

AU - Skarka, Marek

AU - Smith, Alexis M.S.

AU - Subjak, Jano

PY - 2020/10/1

Y1 - 2020/10/1

N2 - We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

AB - We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

KW - K2-280)

KW - planets and satellites: detection

KW - stars: individual: (EPIC 216494238

KW - techniques: photometric

KW - techniques: radial velocities

KW - techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=85097431153&partnerID=8YFLogxK

U2 - 10.1093/mnras/staa2077

DO - 10.1093/mnras/staa2077

M3 - Article

AN - SCOPUS:85097431153

SN - 0035-8711

VL - 497

SP - 4423

EP - 4435

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

K2-280 b-a low density warm sub-Saturn around a mildly evolved star

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Keywords

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