Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602

Autor: Georgina Dransfield, L. G. Bouma, John H. Livingston, C. G. Tinney, Phil Evans, Christopher J. Burke, Sara Seager, G. Á. Bakos, Thomas Henning, J. P. de Leon, Djamel Mékarnia, Joshua N. Winn, Keivan G. Stassun, Jon M. Jenkins, N. Crouzet, Waqas Bhatti, Christoph Bergmann, Joseph E. Rodriguez, Maja Vučković, Néstor Espinoza, C. Ziegler, Samuel N. Quinn, Andrés Jordán, George Zhou, George R. Ricker, Karen A. Collins, W. Marie-Sainte, Trifon Trifonov, Joel D. Hartman, Tristan Guillot, Rafael Brahm, A. Levine, Elisa V. Quintana, M. Barbieri, Amaury H. M. J. Triaud, Jose I. Vines, Diana Dragomir, Sangeetha Nandakumar, Jeffrey C. Smith, Roland Vanderspek, Bill Wohler, Lyu Abe, Andrew W. Mann, Paula Sarkis, Nicholas M. Law
Přispěvatelé: Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2020
Předmět:
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
010504 meteorology & atmospheric sciences
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Orbital period
01 natural sciences
Exoplanet
Radial velocity
Photometry (optics)
Stars
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Planet
0103 physical sciences
010303 astronomy & astrophysics
Planetary mass
ComputingMilieux_MISCELLANEOUS
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics - Earth and Planetary Astrophysics
0105 earth and related environmental sciences
Open cluster
Zdroj: The Astronomical Journal
The Astronomical Journal, American Astronomical Society, 2020, 160 (5), pp.239. ⟨10.3847/1538-3881/abb9ab⟩
ISSN: 0004-6256
1538-3881
DOI: 10.48550/arxiv.2009.07845
Popis: We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA TESS mission, the ESA Gaia mission, ground-based photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON, FEROS, and Veloce. We find that TOI 837 is a $T=9.9$ mag G0/F9 dwarf in the southern open cluster IC 2602. The star and planet are therefore $35^{+11}_{-5}$ million years old. Combining the transit photometry with a prior on the stellar parameters derived from the cluster color-magnitude diagram, we find that the planet has an orbital period of $8.3\,{\rm d}$ and is slightly smaller than Jupiter ($R_{\rm p} = 0.77^{+0.09}_{-0.07} \,R_{\rm Jup}$). From radial velocity monitoring, we limit $M_{\rm p}\sin i$ to less than 1.20 $M_{\rm Jup}$ (3-$\sigma$). The transits either graze or nearly graze the stellar limb. Grazing transits are a cause for concern, as they are often indicative of astrophysical false positive scenarios. Our follow-up data show that such scenarios are unlikely. Our combined multi-color photometry, high-resolution imaging, and radial velocities rule out hierarchical eclipsing binary scenarios. Background eclipsing binary scenarios, though limited by speckle imaging, remain a 0.2% possibility. TOI 837b is therefore a validated adolescent exoplanet. The planetary nature of the system can be confirmed or refuted through observations of the stellar obliquity and the planetary mass. Such observations may also improve our understanding of how the physical and orbital properties of exoplanets change in time.
Comment: AJ accepted. Figure 11 is my favorite. Comments welcome!
Databáze: OpenAIRE
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