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A low-mass stellar companion to the young variable star RZ Psc
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Kennedy, Grant M., Ginski, Christian, Sturm, Ardjan, Stolker, Tomas, Rab, Christian, Quiroga-Nuñez, Luis Henry, Milli, Julien, Ménard, François, Kral, Quentin, van Holstein, Rob G., Henning, Thomas, Benisty, Myriam and Kenworthy, Matthew A. (2020) A low-mass stellar companion to the young variable star RZ Psc. Monthly Notices of the Royal Astronomical Society : Letters, 496 (1). L75-L79. doi:10.1093/mnrasl/slaa092 ISSN 1745-3925.
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WRAP-A-low-mass-stellar-companion-young-variable-star-Kennedy-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1026Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnrasl/slaa092
Abstract
RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest that the dimming events do not probe a typical sightline through the circumstellar dust, and are instead caused by structures that appear above an optically thick mid-plane. This system may therefore be similar to systems where an outer disc is shadowed by material closer to the star. Here, we report the discovery that RZ Psc hosts a 0.12M⊙ companion at a projected separation of 23 au. We conclude that the disc must orbit the primary star. While we do not detect orbital motion, comparison of the angle of linear polarization of the primary with the companion's on-sky position angle provides circumstantial evidence that the companion and disc may not share the same orbital plane. Whether the companion severely disrupts the disc, truncates it, or has little effect at all will require further observations of both the companion and disc.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Circumstellar matter , Double stars , Double stars -- Masses , Stars -- Formation, Disks (Astrophysics) | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society : Letters | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 1745-3925 | ||||||||
Official Date: | July 2020 | ||||||||
Dates: |
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Volume: | 496 | ||||||||
Number: | 1 | ||||||||
Page Range: | L75-L79 | ||||||||
DOI: | 10.1093/mnrasl/slaa092 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society : Letters following peer review. The version of record Grant M Kennedy, Christian Ginski, Matthew A Kenworthy, Myriam Benisty, Thomas Henning, Rob G van Holstein, Quentin Kral, François Ménard, Julien Milli, Luis Henry Quiroga-Nuñez, Christian Rab, Tomas Stolker, Ardjan Sturm, A low-mass stellar companion to the young variable star RZ Psc, Monthly Notices of the Royal Astronomical Society: Letters, Volume 496, Issue 1, July 2020, Pages L75–L79 is available online at: http://dx.doi.org/10.1093/mnrasl/slaa092 | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 26 June 2020 | ||||||||
Date of first compliant Open Access: | 26 June 2020 | ||||||||
Open Access Version: |
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