Dynamo activity of the K dwarf KOI-883 from transit photometry mapping

Zaleski, S. M. and Valio, A. and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 and Marsden, S. C. ORCID: https://orcid.org/0000-0001-5522-8887 (2022) Dynamo activity of the K dwarf KOI-883 from transit photometry mapping. Monthly Notices of the Royal Astronomical Society, 510 (4). pp. 5348-5361. ISSN 0035-8711

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Abstract

The Kepler mission target star KOI-883 is notable in being a low-mass K2V dwarf with moderately fast 8.99-d rotation and hosting a single transiting hot Jupiter in a 2.69-d orbit. This combination thus presents a particular opportunity to study star-spot activity by using the many deep planetary transits apparent in the light curve to map the stellar surface. The data have been analysed using spot modelling and temporal mapping methods we have used for other Kepler host stars, and a search for flares was conducted. Our results indicate a low-latitude region of the photosphere marked by distinct areas of individual or grouped star-spots with moderately high solar-type differential rotation of 0.102 ± 0.011 rad d<SUP>-1</SUP>, but with just two major flares observed across 400 d. These results imply a rotational shear significantly greater than that of our slower rotating Sun. The observed flares are more energetic than typical solar flares, but similar to those of other magnetically active cool dwarfs.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 27 Jul 2022 04:52
Last Modified: 27 Jul 2022 04:52
Uncontrolled Keywords: stars: flare; stars: low-mass; stars: rotation; stars: solar-type; star-spots
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stab3788
URI: http://eprints.usq.edu.au/id/eprint/50223

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