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The little dippers : transits of star-grazing exocomets?

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Ansdell, M., Gaidos, E., Jacobs, T. L., Mann, A., Manara, C. F., Kennedy, Grant M., Vanderburg, A., Kenworthy, M., Hirano, T., LaCourse, D. M., Hedges, C. and Frasca, A. (2019) The little dippers : transits of star-grazing exocomets? Monthly Notices of the Royal Astronomical Society, 483 (3). pp. 3579-3591. doi:10.1093/mnras/sty3289 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/sty3289

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Abstract

We describe EPIC 205718330 and EPIC 235240266, two systems identified in the K2 data whose light curves contain episodic drops in brightness with shapes and durations similar to those of the young `dipper' stars, yet shallower by ˜1-2 orders of magnitude. These `little dippers' have diverse profile shapes with durations of ≃0.5-1.0 d and depths of ≃0.1-1.0 per cent in flux; however, unlike most of the young dipper stars, these do not exhibit any detectable infrared excess indicative of protoplanetary discs, and our ground-based follow-up spectra lack any signatures of youth while indicating that these objects are kinematically old. After ruling out instrumental and/or data processing artefacts as sources of the dimming events, we investigate possible astrophysical mechanisms based on the light curve and stellar properties. We argue that the little dippers are consistent with transits of star-grazing exocomets, and speculate that they are signposts of massive non-transiting exoplanets driving the close-approach orbits.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Comets, Asteroids, Planetary systems
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 1 March 2019
Dates:
DateEvent
1 March 2019Published
3 December 2018Available
29 November 2018Accepted
Volume: 483
Number: 3
Page Range: pp. 3579-3591
DOI: 10.1093/mnras/sty3289
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 following peer review. The version of record M Ansdell, E Gaidos, T L Jacobs, A Mann, C F Manara, G M Kennedy, A Vanderburg, M Kenworthy, T Hirano, D M LaCourse, C Hedges, A Frasca; The little dippers: transits of star-grazing exocomets?, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, 1 March 2019, Pages 3579–3591 is available online at: http://dx.doi.org/10.1093/mnras/sty3289
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 8 January 2019
Date of first compliant Open Access: 8 January 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDUniversity of California Berkeleyhttp://dx.doi.org/10.13039/100006978
AST-1518332National Science Foundationhttp://dx.doi.org/10.13039/100000001
NNX15AC89G[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
NNX15AD95G/NEXSS[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
0101.C-0866European Southern Observatoryhttp://dx.doi.org/10.13039/501100004604
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
Sagan Fellowship Program[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
Gaia Multilateral AgreementEuropean Space Agencyhttp://dx.doi.org/10.13039/501100000844
JP16K17660[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
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