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

Research output: Research - peer-reviewJournal article

DOI

  • Fei Dai
    Fei Daifd284@mit.edu 0000-0002-8958-0683
  • Joshua N. Winn
    Joshua N. WinnDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA 0000-0002-4265-047X
  • Davide Gandolfi
    Davide GandolfiDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0001-8627-9628
  • Sharon X. Wang
    Sharon X. WangDepartment of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA
  • Johanna K. Teske
    Johanna K. TeskeThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
  • Jennifer Burt
    Jennifer BurtDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA 0000-0002-0040-6815
  • Simon Albrecht
  • Oscar Barragán
    Oscar BarragánDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0003-0563-0493
  • William D. Cochran
    William D. CochranDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA 0000-0001-9662-3496
  • Michael Endl
    Michael EndlDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA 0000-0002-7714-6310
  • Malcolm Fridlund
    Malcolm FridlundDepartment of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden 0000-0003-2180-9936
  • Artie P. Hatzes
    Artie P. HatzesThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany
  • Teruyuki Hirano
    Teruyuki HiranoDepartment of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
  • Lea A. Hirsch
    Lea A. HirschDepartment of Physics, University of California, Berkeley, CA 94720, USA
  • Marshall C. Johnson
    Marshall C. JohnsonDepartment of Astronomy, The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USA 0000-0002-5099-8185
  • Anders Bo Justesen
  • John Livingston
    John LivingstonDepartment of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan
  • Carina M. Persson
    Carina M. PerssonDepartment of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden 0000-0003-1257-5146
  • Jorge Prieto-Arranz
    Jorge Prieto-ArranzDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-4609-6269
  • Andrew Vanderburg
    Andrew VanderburgHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 0000-0001-7246-5438
  • Roi Alonso
    Roi AlonsoDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-4609-6269
  • Giuliano Antoniciello
    Giuliano AntonicielloDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0003-0563-0493
  • Pamela Arriagada
    Pamela ArriagadaDepartment of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA 0000-0002-3578-551X
  • R. P. Butler
    R. P. ButlerDepartment of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA 0000-0003-1305-3761
  • Juan Cabrera
    Juan CabreraInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany 0000-0001-6653-5487
  • Jeffrey D. Crane
    Jeffrey D. CraneThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA 0000-0002-5226-787X
  • Felice Cusano
    Felice CusanoINAF—Osservatorio Astronomico di Bologna, Via Ranzani, 1, I-20127, Bologna, Italy 0000-0003-2910-6565
  • Szilárd Csizmadia
    Szilárd CsizmadiaInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • Hans Deeg
    Hans DeegDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0003-0047-4241
  • Sergio B. Dieterich
    Sergio B. DieterichDepartment of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington DC, 20015-1305, USA
  • Philipp Eigmüller
    Philipp EigmüllerInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • Anders Erikson
    Anders EriksonInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • Mark E. Everett
    Mark E. EverettNational Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719, USA 0000-0002-0885-7215
  • Akihiko Fukui
    Akihiko FukuiOkayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, 719-0232 Okayama, Japan 0000-0002-4909-5763
  • Sascha Grziwa
    Sascha GrziwaRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • Eike W. Guenther
    Eike W. GuentherThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany
  • Gregory W. Henry
    Gregory W. HenryCenter of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209, USA 0000-0003-4155-8513
  • Steve B. Howell
    Steve B. HowellNASA Ames Research Center, Moffett Field, CA 94035, USA 0000-0002-2532-2853
  • John Asher Johnson
    John Asher JohnsonHarvard-Smithsonian Center for Astrophysics, 60 Garden Street Cambridge, MA 02138, USA 0000-0001-9911-7388
  • Judith Korth
    Judith KorthRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • Masayuki Kuzuhara
    Masayuki KuzuharaNational Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 0000-0001-8511-2981
  • Norio Narita
    Norio NaritaNational Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 0000-0001-8511-2981
  • David Nespral
    David NespralDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-4609-6269
  • Grzegorz Nowak
    Grzegorz NowakDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-7031-7754
  • Enric Palle
    Enric PalleDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-4609-6269
  • Martin Pätzold
    Martin PätzoldRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • Heike Rauer
    Heike RauerCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany
  • Pilar Montañés Rodríguez
    Pilar Montañés RodríguezDepartamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-4609-6269
  • Stephen A. Shectman
    Stephen A. ShectmanThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
  • Alexis M. S. Smith
    Alexis M. S. SmithInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • Ian B. Thompson
    Ian B. ThompsonThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
  • Vincent Van Eylen
    Vincent Van EylenLeiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands
  • Michael W. Williamson
    Michael W. WilliamsonCenter of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Blvd., Box 9501, Nashville, TN 37209, USA
  • Robert A. Wittenmyer
    Robert A. WittenmyerUniversity of Southern Queensland, Computational Science and Engineering Research Centre, Toowoomba QLD Australia 0000-0001-9957-9304
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+/- 1.6 {M}\oplus and a mean density of {6.0}-2.7+3.0 g cm‑3.
Original languageEnglish
JournalThe Astronomical Journal
Volume154
Issue number6
Pages (from-to)226
Number of pages17
ISSN0004-6256
DOIs
StatePublished - 1 Dec 2017

    Research areas

  • planetary systems, stars: individual: EPIC 228732031

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