K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N

A. Mortier; A. S. Bonomo; V. M. Rajpaul; L. A. Buchhave; A. Vanderburg; L. Zeng; M. López-Morales; L. Malavolta; A. Collier Cameron; C. D. Dressing; P. Figueira; V. Nascimbeni; K. Rice; A. Sozzetti; C. Watson; L. Affer; F. Bouchy; D. Charbonneau; A. Harutyunyan; R. D. Haywood; J. A. Johnson; D. W. Latham; C. Lovis; A. F. Martinez Fiorenzano; M. Mayor; G. Micela; E. Molinari; F. Motalebi; F. Pepe; G. Piotto; D. Phillips; E. Poretti; D. Sasselov; D. Ségransan; S. Udry

doi:10.1093/mnras/sty2360

K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N

A. Mortier, A. S. Bonomo, V. M. Rajpaul, L. A. Buchhave, A. Vanderburg, L. Zeng, M. López-Morales, L. Malavolta, A. Collier Cameron, C. D. Dressing, P. Figueira, V. Nascimbeni, K. Rice, A. Sozzetti, C. Watson, L. Affer, F. Bouchy, D. Charbonneau, A. Harutyunyan, R. D. HaywoodJ. A. Johnson, D. W. Latham, C. Lovis, A. F. Martinez Fiorenzano, M. Mayor, G. Micela, E. Molinari, F. Motalebi, F. Pepe, G. Piotto, D. Phillips, E. Poretti, D. Sasselov, D. Ségransan, S. Udry

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Abstract

This paper reports on the validation and mass measurement of K2-263 b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of 50.818947 ± 0.000094 days and a radius of 2.41± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities. A combined fit of the transit and radial velocity data reveals that K2-263 b has a mass of 14.8 ± 3.1 M⊕. Its bulk density 5.7_-1.4^+1.6 g cm^-3 implies that this planet has a significant envelope of water or other volatiles around a rocky core. K2-263 b likely formed in a similar way as the cores of the four giant planets in our own Solar System, but for some reason, did not accrete much gas. The planetary mass was confirmed by an independent Gaussian process-based fit to both the RVs and the spectroscopic activity indicators. K2-263 b belongs to only a handful of confirmed K2 exoplanets with periods longer than 40 d. It is among the longest periods for a small planet with a precisely determined mass using RVs.

Original language	English
Pages (from-to)	1839–1847
Journal	Monthly Notices of the Royal Astronomical Society
Volume	481
Issue number	2
Early online date	3 Sept 2018
DOIs	https://doi.org/10.1093/mnras/sty2360
Publication status	Published - 1 Dec 2018

Keywords

Planets and satellites: EPIC211682544 b
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic

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10.1093/mnras/sty2360

Mortier-2018-EPIC11682544b-MNRAS-AAM
© 2018, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty2360
Accepted author manuscript, 1.43 MB

http://adsabs.harvard.edu/abs/2018arXiv180808187M

Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021
Jardine, M. M. (PI), Bonnell, I. A. (CoI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Dominik, M. (CoI), Helling, C. (CoI), Horne, K. D. (CoI), Scholz, A. (CoI), Tojeiro, R. (CoI), Weijmans, A.-M. (CoI), Wild, V. (CoI), Woitke, P. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
1/04/18 → 31/03/22
Project: Standard
Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
EU FP7 Space ETAEARTH: ETAEARTH
Cameron, A. C. (PI)
European Commission
1/01/13 → 31/12/17
Project: Standard

Cite this

Mortier, A., Bonomo, A. S., Rajpaul, V. M., Buchhave, L. A., Vanderburg, A., Zeng, L., López-Morales, M., Malavolta, L., Collier Cameron, A., Dressing, C. D., Figueira, P., Nascimbeni, V., Rice, K., Sozzetti, A., Watson, C., Affer, L., Bouchy, F., Charbonneau, D., Harutyunyan, A., ... Udry, S. (2018). K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N. Monthly Notices of the Royal Astronomical Society, 481(2), 1839–1847. https://doi.org/10.1093/mnras/sty2360

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title = "K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N",

abstract = "This paper reports on the validation and mass measurement of K2-263 b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of 50.818947 ± 0.000094 days and a radius of 2.41± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities. A combined fit of the transit and radial velocity data reveals that K2-263 b has a mass of 14.8 ± 3.1 M⊕. Its bulk density 5.7-1.4+1.6 g cm-3 implies that this planet has a significant envelope of water or other volatiles around a rocky core. K2-263 b likely formed in a similar way as the cores of the four giant planets in our own Solar System, but for some reason, did not accrete much gas. The planetary mass was confirmed by an independent Gaussian process-based fit to both the RVs and the spectroscopic activity indicators. K2-263 b belongs to only a handful of confirmed K2 exoplanets with periods longer than 40 d. It is among the longest periods for a small planet with a precisely determined mass using RVs.",

keywords = "Planets and satellites: EPIC211682544 b, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic",

author = "A. Mortier and Bonomo, {A. S.} and Rajpaul, {V. M.} and Buchhave, {L. A.} and A. Vanderburg and L. Zeng and M. L{\'o}pez-Morales and L. Malavolta and {Collier Cameron}, A. and Dressing, {C. D.} and P. Figueira and V. Nascimbeni and K. Rice and A. Sozzetti and C. Watson and L. Affer and F. Bouchy and D. Charbonneau and A. Harutyunyan and Haywood, {R. D.} and Johnson, {J. A.} and Latham, {D. W.} and C. Lovis and {Martinez Fiorenzano}, {A. F.} and M. Mayor and G. Micela and E. Molinari and F. Motalebi and F. Pepe and G. Piotto and D. Phillips and E. Poretti and D. Sasselov and D. S{\'e}gransan and S. Udry",

year = "2018",

month = dec,

day = "1",

doi = "10.1093/mnras/sty2360",

language = "English",

volume = "481",

pages = "1839–1847",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Mortier, A, Bonomo, AS, Rajpaul, VM, Buchhave, LA, Vanderburg, A, Zeng, L, López-Morales, M, Malavolta, L, Collier Cameron, A, Dressing, CD, Figueira, P, Nascimbeni, V, Rice, K, Sozzetti, A, Watson, C, Affer, L, Bouchy, F, Charbonneau, D, Harutyunyan, A, Haywood, RD, Johnson, JA, Latham, DW, Lovis, C, Martinez Fiorenzano, AF, Mayor, M, Micela, G, Molinari, E, Motalebi, F, Pepe, F, Piotto, G, Phillips, D, Poretti, E, Sasselov, D, Ségransan, D & Udry, S 2018, 'K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N', Monthly Notices of the Royal Astronomical Society, vol. 481, no. 2, pp. 1839–1847. https://doi.org/10.1093/mnras/sty2360

TY - JOUR

T1 - K2-263 b

T2 - a 50-day period sub-Neptune with a mass measurement using HARPS-N

AU - Mortier, A.

AU - Bonomo, A. S.

AU - Rajpaul, V. M.

AU - Buchhave, L. A.

AU - Vanderburg, A.

AU - Zeng, L.

AU - López-Morales, M.

AU - Malavolta, L.

AU - Collier Cameron, A.

AU - Dressing, C. D.

AU - Figueira, P.

AU - Nascimbeni, V.

AU - Rice, K.

AU - Sozzetti, A.

AU - Watson, C.

AU - Affer, L.

AU - Bouchy, F.

AU - Charbonneau, D.

AU - Harutyunyan, A.

AU - Haywood, R. D.

AU - Johnson, J. A.

AU - Latham, D. W.

AU - Lovis, C.

AU - Martinez Fiorenzano, A. F.

AU - Mayor, M.

AU - Micela, G.

AU - Molinari, E.

AU - Motalebi, F.

AU - Pepe, F.

AU - Piotto, G.

AU - Phillips, D.

AU - Poretti, E.

AU - Sasselov, D.

AU - Ségransan, D.

AU - Udry, S.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - This paper reports on the validation and mass measurement of K2-263 b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of 50.818947 ± 0.000094 days and a radius of 2.41± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities. A combined fit of the transit and radial velocity data reveals that K2-263 b has a mass of 14.8 ± 3.1 M⊕. Its bulk density 5.7-1.4+1.6 g cm-3 implies that this planet has a significant envelope of water or other volatiles around a rocky core. K2-263 b likely formed in a similar way as the cores of the four giant planets in our own Solar System, but for some reason, did not accrete much gas. The planetary mass was confirmed by an independent Gaussian process-based fit to both the RVs and the spectroscopic activity indicators. K2-263 b belongs to only a handful of confirmed K2 exoplanets with periods longer than 40 d. It is among the longest periods for a small planet with a precisely determined mass using RVs.

AB - This paper reports on the validation and mass measurement of K2-263 b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of 50.818947 ± 0.000094 days and a radius of 2.41± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities. A combined fit of the transit and radial velocity data reveals that K2-263 b has a mass of 14.8 ± 3.1 M⊕. Its bulk density 5.7-1.4+1.6 g cm-3 implies that this planet has a significant envelope of water or other volatiles around a rocky core. K2-263 b likely formed in a similar way as the cores of the four giant planets in our own Solar System, but for some reason, did not accrete much gas. The planetary mass was confirmed by an independent Gaussian process-based fit to both the RVs and the spectroscopic activity indicators. K2-263 b belongs to only a handful of confirmed K2 exoplanets with periods longer than 40 d. It is among the longest periods for a small planet with a precisely determined mass using RVs.

KW - Planets and satellites: EPIC211682544 b

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Techniques: spectroscopic

U2 - 10.1093/mnras/sty2360

DO - 10.1093/mnras/sty2360

M3 - Article

SN - 0035-8711

VL - 481

SP - 1839

EP - 1847

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

K2-263 b: a 50-day period sub-Neptune with a mass measurement using HARPS-N

Abstract

Keywords

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Projects

Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

EU FP7 Space ETAEARTH: ETAEARTH

Cite this