A Well-aligned Orbit for the 45 Myr-old Transiting Neptune DS Tuc Ab

Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Winn, J. N. and Newton, E. R. and Quinn, S. N. and Rodriguez, J. E. and Mann, A. W. and Rizzuto, A. C. and Vanderburg, A. M. and Huang, C. X. ORCID: https://orcid.org/0000-0003-0918-7484 and Latham, D. W. and Teske, J. K. and Wang, S. and Shectman, S. A. and Butler, R. P. and Crane, J. D. and Thompson, I. and Henry, T. J. and Paredes, L. A. and Jao, W. C. and James, H. S. and Hinojosa, R. (2020) A Well-aligned Orbit for the 45 Myr-old Transiting Neptune DS Tuc Ab. The Astrophysical Journal Letters, 892 (2):L21. pp. 1-8. ISSN 2041-8205

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DS Tuc Ab is a Neptune-sized planet that orbits around a G star in the 45 Myr old Tucana-Horologium moving group. Here, we report the measurement of the sky-projected angle between the stellar spin axis and the planet's orbital axis, based on the observation of the Rossiter-McLaughlin effect during three separate planetary transits. The orbit appears to be well aligned with the equator of the host star, with a projected obliquity of. In addition to the distortions in the stellar absorption lines due to the transiting planet, we observed variations that we attribute to large starspots, with angular sizes of tens of degrees. The technique that we have developed for simultaneous modeling of starspots and the planet-induced distortions may be useful in other observations of planets around active stars.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Jan 2022 23:10
Last Modified: 06 May 2022 02:46
Uncontrolled Keywords: 491; 490; 1582; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/2041-8213/ab7d3c
URI: http://eprints.usq.edu.au/id/eprint/45057

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