Stellar Spin-Orbit Alignment for Kepler-9, a Multi-transiting Planetary System with Two Outer Planets Near 2:1 Resonance

Wang, Songhu and Addison, Brett ORCID: https://orcid.org/0000-0003-3216-0626 and Fischer, Debra A. and Brewer, John M. and Isaacson, Howard and Howard, Andrew W. and Laughlin, Gregory (2018) Stellar Spin-Orbit Alignment for Kepler-9, a Multi-transiting Planetary System with Two Outer Planets Near 2:1 Resonance. The Astronomical Journal, 155 (2):70. pp. 1-6. ISSN 0004-6256


Abstract

We present spectroscopic measurements of the Rossiter-McLaughlin effect for the planet b of the Kepler-9 multi-transiting planetary system. The resulting sky-projected spin-orbit angle is λ = -13° ± 16°, which favors an aligned system and strongly disfavors highly misaligned, polar, and retrograde orbits. Including Kepler-9, there are now a total of four Rossiter-McLaughlin effect measurements for multiplanet systems, all of which are consistent with spin-orbit alignment.


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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: 25 Jan 2021 06:31
Last Modified: 01 Feb 2021 01:08
Uncontrolled Keywords: methods: observational; planetary systems; planets and satellites:; individual: Kepler-9b; stars: individual: Kepler-9; techniques: radial; velocities; techniques: spectroscopic; Astrophysics - Earth and; Planetary 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/10.3847/1538-3881/aaa2fb
URI: http://eprints.usq.edu.au/id/eprint/40619

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