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korth

Judith Korth

Postdoc

korth

Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops

Author

  • H.P. Osborn
  • M.B. Davies
  • J. Korth
  • J.N. Winn

Summary, in English

HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes. © 2023 The Author(s).

Department/s

  • eSSENCE: The e-Science Collaboration
  • Mathematics (Faculty of Sciences)
  • LU Profile Area: Natural and Artificial Cognition
  • Astrophysics
  • Lund Observatory - Undergoing reorganization

Publishing year

2023

Language

English

Pages

3069-3089

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

523

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • binaries: spectroscopic
  • eclipses
  • occultations
  • planets and satellites: detection
  • surveys
  • Giant stars
  • Orbits
  • Photometry
  • Planets
  • Satellites
  • Binaries: spectroscopic
  • Eclipse
  • High-resolution spectroscopy
  • Interior structure
  • Low-mass
  • Neptune
  • Occultation
  • Planet-C
  • Planets and satellites: detections
  • Times series
  • Spectroscopic analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711