K2-114b and K2-115b: two transiting warm Jupiters

Avi Shporer; George Zhou; Benjamin J. Fulton; Andrew Vanderburg; Nestor Espinoza; Karen Collins; David Ciardi; Daniel Bayliss; James D. Armstrong; Joao Bento; Francois Bouchy; William D. Cochran; Andrew Collier Cameron; Knicole Colón; Ian Crossfield; Diana Dragomir; Andrew W. Howard; Steve B. Howell; Howard Isaacson; John F. Kielkopf; Felipe Murgas; Ramotholo Sefako; Evan Sinukoff; Robert Siverd; Stephane Udry

doi:10.3847/1538-3881/aa8bb9

K2-114b and K2-115b: two transiting warm Jupiters

Avi Shporer, George Zhou, Benjamin J. Fulton, Andrew Vanderburg, Nestor Espinoza, Karen Collins, David Ciardi, Daniel Bayliss, James D. Armstrong, Joao Bento, Francois Bouchy, William D. Cochran, Andrew Collier Cameron, Knicole Colón, Ian Crossfield, Diana Dragomir, Andrew W. Howard, Steve B. Howell, Howard Isaacson, John F. KielkopfFelipe Murgas, Ramotholo Sefako, Evan Sinukoff, Robert Siverd, Stephane Udry

Research output: Contribution to journal › Article › peer-review

Abstract

We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg⁻¹ cm⁻², equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in K2 photometry. K2-114b has a mass of 1.85^(+0.23)_(-0.22) M_J, a radius of 0.942^(+0.032)_(-0.020) R_J, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) M_J, a radius of 1.115^(+0.057)_(-0.061) R_J, and an orbital period of 20.3 days. Both planets are among the longest-period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated, as their radii are consistent with theoretical expectations. Their position in the planet radius–stellar irradiation diagram is consistent with the scenario where the radius–irradiation correlation levels off below about 10⁸erg s⁻¹cm⁻², suggesting that for warm Jupiters stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another K2 transiting warm Jupiter candidate, EPIC 212504617, as a false positive.

Original language	English
Article number	188
Number of pages	11
Journal	Astronomical Journal
Volume	154
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/aa8bb9
Publication status	Published - 20 Oct 2017

Keywords

Stars: individual: K2-114
EPIC 211418729
K2-115
EPIC 211442297
EPIC 212504617

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Cameron_2017_AJ_WarmJupiters_FinalPubVersion
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http://adsabs.harvard.edu/abs/2017AJ....154..188S

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

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Shporer, A., Zhou, G., Fulton, B. J., Vanderburg, A., Espinoza, N., Collins, K., Ciardi, D., Bayliss, D., Armstrong, J. D., Bento, J., Bouchy, F., Cochran, W. D., Collier Cameron, A., Colón, K., Crossfield, I., Dragomir, D., Howard, A. W., Howell, S. B., Isaacson, H., ... Udry, S. (2017). K2-114b and K2-115b: two transiting warm Jupiters. Astronomical Journal, 154(5), Article 188. https://doi.org/10.3847/1538-3881/aa8bb9

@article{f3312f9078274f16831a9356111c7da9,

title = "K2-114b and K2-115b: two transiting warm Jupiters",

abstract = "We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg−1 cm−2, equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in K2 photometry. K2-114b has a mass of 1.85^(+0.23)_(-0.22) MJ, a radius of 0.942^(+0.032)_(-0.020) RJ, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) MJ, a radius of 1.115^(+0.057)_(-0.061) RJ, and an orbital period of 20.3 days. Both planets are among the longest-period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated, as their radii are consistent with theoretical expectations. Their position in the planet radius–stellar irradiation diagram is consistent with the scenario where the radius–irradiation correlation levels off below about 108 erg s−1 cm−2, suggesting that for warm Jupiters stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another K2 transiting warm Jupiter candidate, EPIC 212504617, as a false positive.",

keywords = "Stars: individual: K2-114, EPIC 211418729, K2-115, EPIC 211442297, EPIC 212504617",

author = "Avi Shporer and George Zhou and Fulton, {Benjamin J.} and Andrew Vanderburg and Nestor Espinoza and Karen Collins and David Ciardi and Daniel Bayliss and Armstrong, {James D.} and Joao Bento and Francois Bouchy and Cochran, {William D.} and {Collier Cameron}, Andrew and Knicole Col{\'o}n and Ian Crossfield and Diana Dragomir and Howard, {Andrew W.} and Howell, {Steve B.} and Howard Isaacson and Kielkopf, {John F.} and Felipe Murgas and Ramotholo Sefako and Evan Sinukoff and Robert Siverd and Stephane Udry",

note = "A.C.C. acknowledges support from STFC consolidated grant number ST/M001296/1.",

year = "2017",

month = oct,

day = "20",

doi = "10.3847/1538-3881/aa8bb9",

language = "English",

volume = "154",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

}

Shporer, A, Zhou, G, Fulton, BJ, Vanderburg, A, Espinoza, N, Collins, K, Ciardi, D, Bayliss, D, Armstrong, JD, Bento, J, Bouchy, F, Cochran, WD, Collier Cameron, A, Colón, K, Crossfield, I, Dragomir, D, Howard, AW, Howell, SB, Isaacson, H, Kielkopf, JF, Murgas, F, Sefako, R, Sinukoff, E, Siverd, R & Udry, S 2017, 'K2-114b and K2-115b: two transiting warm Jupiters', Astronomical Journal, vol. 154, no. 5, 188. https://doi.org/10.3847/1538-3881/aa8bb9

TY - JOUR

T1 - K2-114b and K2-115b

T2 - two transiting warm Jupiters

AU - Shporer, Avi

AU - Zhou, George

AU - Fulton, Benjamin J.

AU - Vanderburg, Andrew

AU - Espinoza, Nestor

AU - Collins, Karen

AU - Ciardi, David

AU - Bayliss, Daniel

AU - Armstrong, James D.

AU - Bento, Joao

AU - Bouchy, Francois

AU - Cochran, William D.

AU - Collier Cameron, Andrew

AU - Colón, Knicole

AU - Crossfield, Ian

AU - Dragomir, Diana

AU - Howard, Andrew W.

AU - Howell, Steve B.

AU - Isaacson, Howard

AU - Kielkopf, John F.

AU - Murgas, Felipe

AU - Sefako, Ramotholo

AU - Sinukoff, Evan

AU - Siverd, Robert

AU - Udry, Stephane

N1 - A.C.C. acknowledges support from STFC consolidated grant number ST/M001296/1.

PY - 2017/10/20

Y1 - 2017/10/20

N2 - We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg−1 cm−2, equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in K2 photometry. K2-114b has a mass of 1.85^(+0.23)_(-0.22) MJ, a radius of 0.942^(+0.032)_(-0.020) RJ, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) MJ, a radius of 1.115^(+0.057)_(-0.061) RJ, and an orbital period of 20.3 days. Both planets are among the longest-period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated, as their radii are consistent with theoretical expectations. Their position in the planet radius–stellar irradiation diagram is consistent with the scenario where the radius–irradiation correlation levels off below about 108 erg s−1 cm−2, suggesting that for warm Jupiters stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another K2 transiting warm Jupiter candidate, EPIC 212504617, as a false positive.

AB - We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg−1 cm−2, equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in K2 photometry. K2-114b has a mass of 1.85^(+0.23)_(-0.22) MJ, a radius of 0.942^(+0.032)_(-0.020) RJ, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) MJ, a radius of 1.115^(+0.057)_(-0.061) RJ, and an orbital period of 20.3 days. Both planets are among the longest-period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated, as their radii are consistent with theoretical expectations. Their position in the planet radius–stellar irradiation diagram is consistent with the scenario where the radius–irradiation correlation levels off below about 108 erg s−1 cm−2, suggesting that for warm Jupiters stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another K2 transiting warm Jupiter candidate, EPIC 212504617, as a false positive.

KW - Stars: individual: K2-114

KW - EPIC 211418729

KW - K2-115

KW - EPIC 211442297

KW - EPIC 212504617

U2 - 10.3847/1538-3881/aa8bb9

DO - 10.3847/1538-3881/aa8bb9

M3 - Article

SN - 0004-6256

VL - 154

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

M1 - 188

ER -

K2-114b and K2-115b: two transiting warm Jupiters

Abstract

Keywords

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

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