K2-291b: A rocky super-Earth in a 2.2 day orbit

Molly R. Kosiarek; Sarah Blunt; Mercedes Lopez-Morales; Ian J. M. Crossfield; Evan Sinukoff; Erik A. Petigura; Erica J. Gonzales; Ennio Poretti; Luca Malavolta; Andrew W. Howard; Howard Isaacson; Raphaelle D. Haywood; David R. Ciardi; Makennah Bristow; Andrew Collier Cameron; David Charbonneau; Courtney D. Dressing; Pedro Figueira; Benjamin J. Fulton; Bronwen J. Hardee; Lea A. Hirsch; David W. Latham; Annelies Mortier; Chantanelle Nava; Joshua E. Schlieder; Andrew Vanderburg; Lauren Weiss; Aldo S. Bonomo; Francois Bouchy; Lars A. Buchhave; Adrien Coffinet; Mario Damasso; Xavier Dumusque; Christophe Lovis; Michel Mayor; Giusi Micela; Emilio Molinari; Francesco Pepe; David Phillips; Giampaolo Piotto; Ken Rice; Dimitar Sasselov; Damien Segransan; Alessandro Sozzetti; Stephane Udry; Chris Watson

doi:10.3847/1538-3881/aafe83

K2-291b: A rocky super-Earth in a 2.2 day orbit

Molly R. Kosiarek, Sarah Blunt, Mercedes Lopez-Morales, Ian J. M. Crossfield, Evan Sinukoff, Erik A. Petigura, Erica J. Gonzales, Ennio Poretti, Luca Malavolta, Andrew W. Howard, Howard Isaacson, Raphaelle D. Haywood, David R. Ciardi, Makennah Bristow, Andrew Collier Cameron, David Charbonneau, Courtney D. Dressing, Pedro Figueira, Benjamin J. Fulton, Bronwen J. HardeeLea A. Hirsch, David W. Latham, Annelies Mortier, Chantanelle Nava, Joshua E. Schlieder, Andrew Vanderburg, Lauren Weiss, Aldo S. Bonomo, Francois Bouchy, Lars A. Buchhave, Adrien Coffinet, Mario Damasso, Xavier Dumusque, Christophe Lovis, Michel Mayor, Giusi Micela, Emilio Molinari, Francesco Pepe, David Phillips, Giampaolo Piotto, Ken Rice, Dimitar Sasselov, Damien Segransan, Alessandro Sozzetti, Stephane Udry, Chris Watson

School of Physics and Astronomy

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

Abstract

EPIC 247418783 is a solar-type star with a radius of R_star = 0.899 $\pm$ 0.034 R_sun and mass of M_star=0.934 $\pm$ 0.038 M_sun. From K2 C13 data, we found one super-Earth planet (R_p = 1.589+0.095-0.072 R_Earth) transiting this star on a short period orbit (P = 2.225177 +6.6e-5 -6.8e-5 days). We followed this system up with adaptive-optic imaging and spectroscopy to derive stellar parameters, search for stellar companions, and determine a planet mass. From our 75 radial velocity measurements using HIRES on Keck I and HARPS-N on Telescopio Nazionale Galileo, we constrained the mass of EPIC 247418783b to M_p = 6.49 $\pm$ 1.16 M_Earth. We found it necessary to model correlated stellar activity radial velocity signals with a Gaussian process in order to more accurately model the effect of stellar noise on our data; the addition of the Gaussian process also improved the precision of this mass measurement. With a bulk density of 8.84+2.50-2.03 g cm-3, the planet is consistent with an Earth-like rock/iron composition and no substantial gaseous envelope. Such an envelope, if it existed in the past, was likely eroded away by photo-evaporation during the first billion years of the star's lifetime.

Original language	English
Number of pages	15
Journal	Astronomical Journal
DOIs	https://doi.org/10.3847/1538-3881/aafe83
Publication status	Published - 13 Feb 2019

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astro-ph.EP

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10.3847/1538-3881/aafe83

78894581Ricev2 - 1901.04558 (003)Accepted author manuscript, 7.87 MB

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Kosiarek, M. R., Blunt, S., Lopez-Morales, M., Crossfield, I. J. M., Sinukoff, E., Petigura, E. A., Gonzales, E. J., Poretti, E., Malavolta, L., Howard, A. W., Isaacson, H., Haywood, R. D., Ciardi, D. R., Bristow, M., Cameron, A. C., Charbonneau, D., Dressing, C. D., Figueira, P., Fulton, B. J., ... Watson, C. (2019). K2-291b: A rocky super-Earth in a 2.2 day orbit. Astronomical Journal. https://doi.org/10.3847/1538-3881/aafe83

@article{f0f0f5d2b43e49c5887a1ac4dc1fbc2b,

title = "K2-291b: A rocky super-Earth in a 2.2 day orbit",

abstract = " EPIC 247418783 is a solar-type star with a radius of R\_star = 0.899 \$\textbackslash{}pm\$ 0.034 R\_sun and mass of M\_star=0.934 \$\textbackslash{}pm\$ 0.038 M\_sun. From K2 C13 data, we found one super-Earth planet (R\_p = 1.589+0.095-0.072 R\_Earth) transiting this star on a short period orbit (P = 2.225177 +6.6e-5 -6.8e-5 days). We followed this system up with adaptive-optic imaging and spectroscopy to derive stellar parameters, search for stellar companions, and determine a planet mass. From our 75 radial velocity measurements using HIRES on Keck I and HARPS-N on Telescopio Nazionale Galileo, we constrained the mass of EPIC 247418783b to M\_p = 6.49 \$\textbackslash{}pm\$ 1.16 M\_Earth. We found it necessary to model correlated stellar activity radial velocity signals with a Gaussian process in order to more accurately model the effect of stellar noise on our data; the addition of the Gaussian process also improved the precision of this mass measurement. With a bulk density of 8.84+2.50-2.03 g cm-3, the planet is consistent with an Earth-like rock/iron composition and no substantial gaseous envelope. Such an envelope, if it existed in the past, was likely eroded away by photo-evaporation during the first billion years of the star's lifetime. ",

keywords = "astro-ph.EP",

author = "Kosiarek, \{Molly R.\} and Sarah Blunt and Mercedes Lopez-Morales and Crossfield, \{Ian J. M.\} and Evan Sinukoff and Petigura, \{Erik A.\} and Gonzales, \{Erica J.\} and Ennio Poretti and Luca Malavolta and Howard, \{Andrew W.\} and Howard Isaacson and Haywood, \{Raphaelle D.\} and Ciardi, \{David R.\} and Makennah Bristow and Cameron, \{Andrew Collier\} and David Charbonneau and Dressing, \{Courtney D.\} and Pedro Figueira and Fulton, \{Benjamin J.\} and Hardee, \{Bronwen J.\} and Hirsch, \{Lea A.\} and Latham, \{David W.\} and Annelies Mortier and Chantanelle Nava and Schlieder, \{Joshua E.\} and Andrew Vanderburg and Lauren Weiss and Bonomo, \{Aldo S.\} and Francois Bouchy and Buchhave, \{Lars A.\} and Adrien Coffinet and Mario Damasso and Xavier Dumusque and Christophe Lovis and Michel Mayor and Giusi Micela and Emilio Molinari and Francesco Pepe and David Phillips and Giampaolo Piotto and Ken Rice and Dimitar Sasselov and Damien Segransan and Alessandro Sozzetti and Stephane Udry and Chris Watson",

note = "Accepted to AJ, 15 pages, 8 figures",

year = "2019",

month = feb,

day = "13",

doi = "10.3847/1538-3881/aafe83",

language = "English",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

}

Kosiarek, MR, Blunt, S, Lopez-Morales, M, Crossfield, IJM, Sinukoff, E, Petigura, EA, Gonzales, EJ, Poretti, E, Malavolta, L, Howard, AW, Isaacson, H, Haywood, RD, Ciardi, DR, Bristow, M, Cameron, AC, Charbonneau, D, Dressing, CD, Figueira, P, Fulton, BJ, Hardee, BJ, Hirsch, LA, Latham, DW, Mortier, A, Nava, C, Schlieder, JE, Vanderburg, A, Weiss, L, Bonomo, AS, Bouchy, F, Buchhave, LA, Coffinet, A, Damasso, M, Dumusque, X, Lovis, C, Mayor, M, Micela, G, Molinari, E, Pepe, F, Phillips, D, Piotto, G, Rice, K, Sasselov, D, Segransan, D, Sozzetti, A, Udry, S & Watson, C 2019, 'K2-291b: A rocky super-Earth in a 2.2 day orbit', Astronomical Journal. https://doi.org/10.3847/1538-3881/aafe83

TY - JOUR

T1 - K2-291b

T2 - A rocky super-Earth in a 2.2 day orbit

AU - Kosiarek, Molly R.

AU - Blunt, Sarah

AU - Lopez-Morales, Mercedes

AU - Crossfield, Ian J. M.

AU - Sinukoff, Evan

AU - Petigura, Erik A.

AU - Gonzales, Erica J.

AU - Poretti, Ennio

AU - Malavolta, Luca

AU - Howard, Andrew W.

AU - Isaacson, Howard

AU - Haywood, Raphaelle D.

AU - Ciardi, David R.

AU - Bristow, Makennah

AU - Cameron, Andrew Collier

AU - Charbonneau, David

AU - Dressing, Courtney D.

AU - Figueira, Pedro

AU - Fulton, Benjamin J.

AU - Hardee, Bronwen J.

AU - Hirsch, Lea A.

AU - Latham, David W.

AU - Mortier, Annelies

AU - Nava, Chantanelle

AU - Schlieder, Joshua E.

AU - Vanderburg, Andrew

AU - Weiss, Lauren

AU - Bonomo, Aldo S.

AU - Bouchy, Francois

AU - Buchhave, Lars A.

AU - Coffinet, Adrien

AU - Damasso, Mario

AU - Dumusque, Xavier

AU - Lovis, Christophe

AU - Mayor, Michel

AU - Micela, Giusi

AU - Molinari, Emilio

AU - Pepe, Francesco

AU - Phillips, David

AU - Piotto, Giampaolo

AU - Rice, Ken

AU - Sasselov, Dimitar

AU - Segransan, Damien

AU - Sozzetti, Alessandro

AU - Udry, Stephane

AU - Watson, Chris

N1 - Accepted to AJ, 15 pages, 8 figures

PY - 2019/2/13

Y1 - 2019/2/13

N2 - EPIC 247418783 is a solar-type star with a radius of R_star = 0.899 $\pm$ 0.034 R_sun and mass of M_star=0.934 $\pm$ 0.038 M_sun. From K2 C13 data, we found one super-Earth planet (R_p = 1.589+0.095-0.072 R_Earth) transiting this star on a short period orbit (P = 2.225177 +6.6e-5 -6.8e-5 days). We followed this system up with adaptive-optic imaging and spectroscopy to derive stellar parameters, search for stellar companions, and determine a planet mass. From our 75 radial velocity measurements using HIRES on Keck I and HARPS-N on Telescopio Nazionale Galileo, we constrained the mass of EPIC 247418783b to M_p = 6.49 $\pm$ 1.16 M_Earth. We found it necessary to model correlated stellar activity radial velocity signals with a Gaussian process in order to more accurately model the effect of stellar noise on our data; the addition of the Gaussian process also improved the precision of this mass measurement. With a bulk density of 8.84+2.50-2.03 g cm-3, the planet is consistent with an Earth-like rock/iron composition and no substantial gaseous envelope. Such an envelope, if it existed in the past, was likely eroded away by photo-evaporation during the first billion years of the star's lifetime.

AB - EPIC 247418783 is a solar-type star with a radius of R_star = 0.899 $\pm$ 0.034 R_sun and mass of M_star=0.934 $\pm$ 0.038 M_sun. From K2 C13 data, we found one super-Earth planet (R_p = 1.589+0.095-0.072 R_Earth) transiting this star on a short period orbit (P = 2.225177 +6.6e-5 -6.8e-5 days). We followed this system up with adaptive-optic imaging and spectroscopy to derive stellar parameters, search for stellar companions, and determine a planet mass. From our 75 radial velocity measurements using HIRES on Keck I and HARPS-N on Telescopio Nazionale Galileo, we constrained the mass of EPIC 247418783b to M_p = 6.49 $\pm$ 1.16 M_Earth. We found it necessary to model correlated stellar activity radial velocity signals with a Gaussian process in order to more accurately model the effect of stellar noise on our data; the addition of the Gaussian process also improved the precision of this mass measurement. With a bulk density of 8.84+2.50-2.03 g cm-3, the planet is consistent with an Earth-like rock/iron composition and no substantial gaseous envelope. Such an envelope, if it existed in the past, was likely eroded away by photo-evaporation during the first billion years of the star's lifetime.

KW - astro-ph.EP

U2 - 10.3847/1538-3881/aafe83

DO - 10.3847/1538-3881/aafe83

M3 - Article

SN - 0004-6256

JO - Astronomical Journal

JF - Astronomical Journal

ER -

K2-291b: A rocky super-Earth in a 2.2 day orbit

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