K2-263 b: a 50 d 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 d 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 d and a radius of 2.41 ± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities (RVs). 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	03 Sept 2018
DOIs	https://doi.org/10.1093/mnras/sty2360
Publication status	Published - 01 Dec 2018

Keywords

techniques: photometric
techniques: radial velocities
techniques: spectroscopic
planets and satellites: individual: K2-263b

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K2-263 b: a 50 d period sub-Neptune with a mass measurement using HARPS-N
Copyright 2018 OUP. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 1.42 MBLicence: Unspecified

http://adsabs.harvard.edu/abs/2018MNRAS.481.1839M

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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 d 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

@article{0fff2fccfbd54d73a48bfb6b19ba89b2,

title = "K2-263 b: a 50 d 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 d and a radius of 2.41 ± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities (RVs). 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 = "techniques: photometric, techniques: radial velocities, techniques: spectroscopic, planets and satellites: individual: K2-263b",

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 d 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: a 50 d 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 d and a radius of 2.41 ± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities (RVs). 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 d and a radius of 2.41 ± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities (RVs). 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 - techniques: photometric

KW - techniques: radial velocities

KW - techniques: spectroscopic

KW - planets and satellites: individual: K2-263b

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 d period sub-Neptune with a mass measurement using HARPS-N

Abstract

Keywords

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