The Discovery and Mass Measurement of a New Ultra-short-period Planet: EPIC 228732031b

Dai, F. and Winn, J. N. and Wang, S. and Teske, J. and Burt, J. and Albrecht, S. and Barragan, O. and Chochran, W. and Endl, M and Fridlund, Malcolm and Hatzes, A. and Hirano, T. and Hirsch, L. and Johnson, M and Justesen, A. and Livingston, J. and Persson, C. M. and Prieto-Arranz, J. and Vanderburg, A. and Alonso, R and Antoniciello, G. and Arriagada, P. and Butler, R.P. and Cabrera, J and Crane, J. and Cusano, F. and Csizmadia, S and Deeg, H and Dietrich, S. and Eigmüller, P and Erikson, A and Everett, M. and Fukui, A. and Grziwa, S. and Guenther, E. and Henry, G. and Howell, S. and Johnson, J.A. and Korth, J. and Kuzuhara, M. and Narita, N. and Nespral, D. and Nowak, G. and Palle, E. and Pätzold, M. and Rauer, H and Rodriguez, P. and Shectman, S. and Smith, A. M. S. and Thompson, I. and Eylen, V. V. and Williamson, M. and Wittenmyer, R. (2017) The Discovery and Mass Measurement of a New Ultra-short-period Planet: EPIC 228732031b. Astronomical Journal, 154 (6), p. 17. American Astronomical Society. doi: 10.3847/1538-3881/aa9065. ISSN 0004-6256.

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Abstract

We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, EPIC 228732031b, was discovered in K2 Campaign 10. It has a radius of ${1.81}_{-0.12}^{+0.16}\,{R}_{\oplus }$ and orbits a G dwarf with a period of 8.9 hr. Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show evidence for stellar activity along with orbital motion. We determined the planetary mass using two different methods: (1) the "floating chunk offset" method, based only on changes in velocity observed on the same night; and (2) a Gaussian process regression based on both the radial velocity and photometric time series. The results are consistent and lead to a mass measurement of $6.5\pm 1.6\,{M}_{\oplus }$ and a mean density of ${6.0}_{-2.7}^{+3.0}$ g cm−3.

Item URL in elib:

https://elib.dlr.de/116396/

Document Type:

Article

Title:

The Discovery and Mass Measurement of a New Ultra-short-period Planet: EPIC 228732031b

Authors:

Authors	Institution or Email of Authors	Author's ORCID iD	ORCID Put Code
Dai, F.	department of physics and kavli institute for astrophysics and space research, massachusetts institute oftechnology, cambridge, ma 02139, usa	UNSPECIFIED	UNSPECIFIED
Winn, J. N.	princeton university, department of astrophysical sciences, 4 ivy lane, princeton, nj 08544 usa	UNSPECIFIED	UNSPECIFIED
Wang, S.	university of surrey, guildford, uk	UNSPECIFIED	UNSPECIFIED
Teske, J.	The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA	UNSPECIFIED	UNSPECIFIED
Burt, J.	Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA	UNSPECIFIED	UNSPECIFIED
Albrecht, S.	stellar astrophysics centre, department of physics and astronomy, aarhus university, ny munkegade 120, dk-8000 aarhus c, denmark	UNSPECIFIED	UNSPECIFIED
Barragan, O.	dipartimento di fisica, universita degli studi di trino, via pietro giuria 1, 10125 torino, italy	UNSPECIFIED	UNSPECIFIED
Chochran, W.	Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX	UNSPECIFIED	UNSPECIFIED
Endl, M	university of texas at austin	UNSPECIFIED	UNSPECIFIED
Fridlund, Malcolm	research and scientific support department, esa, european space research and technology centre, noordwijk, the netherlands	UNSPECIFIED	UNSPECIFIED
Hatzes, A.	thüringer landessternwarte tautenburg	UNSPECIFIED	UNSPECIFIED
Hirano, T.	department of earth and planetary sciences, tokyo institute of technology, 2-12-1 ookayama, meguro-ku, tokyo 152-8551, japan	UNSPECIFIED	UNSPECIFIED
Hirsch, L.	University of California at Berkeley, Berkeley, CA 94720, USA	UNSPECIFIED	UNSPECIFIED
Johnson, M	Department of Astronomy, The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USA	UNSPECIFIED	UNSPECIFIED
Justesen, A.	Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark	UNSPECIFIED	UNSPECIFIED
Livingston, J.	department of astronomy, the university of tokyo, 7-3-1 bunkyo-ku, tokyo 113-0033, japan	UNSPECIFIED	UNSPECIFIED
Persson, C. M.	department of earth and space sciences, chalmers university of technology, onsala space observatory, 439 92, onsala, sweden	UNSPECIFIED	UNSPECIFIED
Prieto-Arranz, J.	instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain \| departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain	UNSPECIFIED	UNSPECIFIED
Vanderburg, A.	Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA	UNSPECIFIED	UNSPECIFIED
Alonso, R	laboratoire d'astrophysique de marseille	UNSPECIFIED	UNSPECIFIED
Antoniciello, G.	dipartimento di fisica, università di torino, via p. giuria 1, i-10125 torino, italy	UNSPECIFIED	UNSPECIFIED
Arriagada, P.	Department of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA	UNSPECIFIED	UNSPECIFIED
Butler, R.P.	Department of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA	UNSPECIFIED	UNSPECIFIED
Cabrera, J	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Crane, J.	The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA	UNSPECIFIED	UNSPECIFIED
Cusano, F.	inaf-osservatorio astronomico di bologna, via ranzani 1, i-40127 bologna, italy	UNSPECIFIED	UNSPECIFIED
Csizmadia, S	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Deeg, H	instituto de astrofisica de canarias	UNSPECIFIED	UNSPECIFIED
Dietrich, S.	Department of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA	UNSPECIFIED	UNSPECIFIED
Eigmüller, P	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Erikson, A	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Everett, M.	National Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719, USA	UNSPECIFIED	UNSPECIFIED
Fukui, A.	okayama astrophysical observatory, national astronomical observatory of japan, asakuchi, 719-0232 okayama,japan	UNSPECIFIED	UNSPECIFIED
Grziwa, S.	rheinisches institut furr umweltforschung an der universitaet zu koeln, aachener strasse 209, 50931 koeln, germany	UNSPECIFIED	UNSPECIFIED
Guenther, E.	thüringer landessternwarte tautenburg	UNSPECIFIED	UNSPECIFIED
Henry, G.	Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209, USA	UNSPECIFIED	UNSPECIFIED
Howell, S.	NASA Ames Research Center, Moffett Field, CA 94035, USA	UNSPECIFIED	UNSPECIFIED
Johnson, J.A.	Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA	UNSPECIFIED	UNSPECIFIED
Korth, J.	rheinisches institut fuer umweltforschung an der universitaet zu koeln, aachener strasse 209, 50931 koeln, germany	UNSPECIFIED	UNSPECIFIED
Kuzuhara, M.	astrobiology center, national institutes of natural sciences, 2-21-1 osawa, mitaka, tokyo 181-8588, japan	UNSPECIFIED	UNSPECIFIED
Narita, N.	department of astronomy, the university of tokyo, 7-3-1 bunkyo-ku, tokyo 113-0033, japan	UNSPECIFIED	UNSPECIFIED
Nespral, D.	instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain \| departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain	UNSPECIFIED	UNSPECIFIED
Nowak, G.	instituto de astrofísicade canarias, 38205 la laguna, tenerife, spain \| departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain	UNSPECIFIED	UNSPECIFIED
Palle, E.	instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain \| departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain	UNSPECIFIED	UNSPECIFIED
Pätzold, M.	institut für geophysik und meteorologie, universität köln	UNSPECIFIED	UNSPECIFIED
Rauer, H	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Rodriguez, P.	european space agency, villafranco del castillo, madrid, spain	UNSPECIFIED	UNSPECIFIED
Shectman, S.	The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA	UNSPECIFIED	UNSPECIFIED
Smith, A. M. S.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Thompson, I.	The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA	UNSPECIFIED	UNSPECIFIED
Eylen, V. V.	leiden observatory, university of leiden, po box 9513, 2300 ra, leiden, the netherlands	UNSPECIFIED	UNSPECIFIED
Williamson, M.	Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209, USA	UNSPECIFIED	UNSPECIFIED
Wittenmyer, R.	University of Southern Queensland, Computational Science and Engineering Research Centre, Toowoomba QLD Australia	UNSPECIFIED	UNSPECIFIED

Date:

2017

Journal or Publication Title:

Astronomical Journal

Refereed publication:

Yes

Open Access:

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

Volume:

154

DOI:

10.3847/1538-3881/aa9065

Page Range:

p. 17

Publisher:

American Astronomical Society

ISSN:

0004-6256

Status:

Published

Keywords:

planetary systems – stars: individual (EPIC 228732031)

HGF - Research field:

Aeronautics, Space and Transport

HGF - Program:

Space

HGF - Program Themes:

Space Exploration

DLR - Research area:

Raumfahrt

DLR - Program:

R EW - Space Exploration

DLR - Research theme (Project):

R - Project PLATO (old)

Location:

Berlin-Adlershof

Institutes and Institutions:

Institute of Planetary Research > Extrasolar Planets and Atmospheres

Deposited By:

Stiebeler, Ulrike

Deposited On:

30 Nov 2017 14:30

Last Modified:

10 Jan 2019 15:46

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