Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103198
Title: Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope
Authors: Brandner, W.
Zinnecker, H.
Kopytova, T.
Issue Date: 2021
Publisher: Oxford University Press
Citation: Brandner W. Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope / W. Brandner, H. Zinnecker, T. Kopytova. — DOI 10.1093/mnras/staa3422 // Monthly Notices of the Royal Astronomical Society. — 2021. — Vol. 500. — Iss. 3. — P. 3920-3925.
Abstract: Only a small number of exoplanets have been identified in stellar cluster environments. We initiated a high angular resolution direct imaging search using the Hubble Space Telescope (HST) and its Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) instrument for self-luminous giant planets in orbit around seven white dwarfs in the 625 Myr old nearby (≈45 pc) Hyades cluster. The observations were obtained with Near-Infrared Camera 1 (NIC1) in the F110W and F160W filters, and encompass two HST roll angles to facilitate angular differential imaging. The difference images were searched for companion candidates, and radially averaged contrast curves were computed. Though we achieve the lowest mass detection limits yet for angular separations ≥0.5 arcsec, no planetary mass companion to any of the seven white dwarfs, whose initial main-sequence masses were >2.8 M⊙, was found. Comparison with evolutionary models yields detection limits of ≈5-7 Jupiter masses (MJup) according to one model, and between 9 and ≈12 MJup according to another model, at physical separations corresponding to initial semimajor axis of ≥5-8 au (i.e. before the mass-loss events associated with the red and asymptotic giant branch phase of the host star). The study provides further evidence that initially dense cluster environments, which included O- and B-type stars, might not be highly conducive to the formation of massive circumstellar discs, and their transformation into giant planets (with m ≥ 6 MJup and a ≥6 au). This is in agreement with radial velocity surveys for exoplanets around G- and K-type giants, which did not find any planets around stars more massive than ≈3 M⊙. © 2021 Oxford University Press. All rights reserved.
Keywords: OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: HYADES
PLANETS AND SATELLITES: DETECTION
PLANETS AND SATELLITES: DYNAMICAL EVOLUTION AND STABILITY
PLANETS AND SATELLITES: FORMATION
PLANETS AND SATELLITES: GASEOUS PLANETS
WHITE DWARFS
URI: http://hdl.handle.net/10995/103198
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85098536873
PURE ID: 20374743
186a7dbb-91d5-4af5-9660-00e57b0a72e8
ISSN: 358711
DOI: 10.1093/mnras/staa3422
metadata.dc.description.sponsorship: We thank S. Reffert, S. Röser, J. van Cleve, and S. Xu for helpful comments on a draft of the paper. This paper is based on observations made with the NASA/ESA Hubble Space Telescope (GO 9737), obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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