The Warm Neptunes around HD 106315 Have Low Stellar Obliquities
Article
Article Title | The Warm Neptunes around HD 106315 Have Low Stellar Obliquities |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Zhou, George (Author), Rodriguez, Joseph E. (Author), Vanderburg, Andrew (Author), Quinn, Samuel N. (Author), Irwin, Jonathan (Author), Huang, Chelsea X. (Author), Latham, David W. (Author), Bieryla, Allyson (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author) and Calkins, Michael L. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 156 (3), pp. 1-10 |
Article Number | 93 |
Number of Pages | 10 |
Year | 2018 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aad085 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aad085 |
Abstract | We present the obliquity of the warm Neptune HD 106315c measured via a series of spectroscopic transit observations. HD 106315c is a 4.4 R Earth warm Neptune orbiting a moderately rotating late F star with a period of 21.05 days. HD 106315 also hosts a 2.5 R Earth super-Earth on a 9.55 day orbit. Our Doppler tomographic analyses of four transits observed by the Magellan/MIKE, HARPS, and TRES facilities find HD 106315c to be in a low stellar obliquity orbit, consistent with being well aligned with the spin axis of the host star at . We suggest, via dynamical N-body simulations, that the two planets in the system must be coplanar, and thus are both well aligned with the host star. HD 106315 is only the fourth warm Neptune system with obliquities measured. All warm Neptune systems have been found in well aligned geometries, consistent with the interpretation that these systems are formed in situ in the inner protoplanetary disk, and also consistent with the majority of Kepler multi-planet systems that are in low obliquity orbits. With a transit depth of 1.02 mmag, HD 106315c is among the smallest planets to have been detected in transit spectroscopy, and we discuss its detection in the context of TESS and the next generations of spectrographs. |
Keywords | planets and satellites: dynamical evolution and stability; planets and satellites: individual: HD 106315; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
University of Texas at Austin, United States | |
Massachusetts Institute of Technology, United States |
https://research.usq.edu.au/item/q6x7z/the-warm-neptunes-around-hd-106315-have-low-stellar-obliquities
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