MOA-2009-BLG-319Lb: A Sub-Saturn Planet inside the Predicted Mass Desert
| Autor: | J.-P. Beaulieu, Andrew A. Cole, Clément Ranc, Calen B. Henderson, Sean K. Terry, Ian A. Bond, Aikaterini Vandorou, J. W. Blackman, Naoki Koshimoto, J. B. Marquette, Aparna Bhattacharya, Jessica R. Lu, David P. Bennett |
|---|---|
| Přispěvatelé: | NASA Goddard Space Flight Center (GSFC), Aston Business School, Aston University [Birmingham], Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), The University of Tokyo (UTokyo) |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Gravitational microlensing 01 natural sciences Planet Primary (astronomy) 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics Giant planet Astronomy Astronomy and Astrophysics Mass ratio Astrophysics - Astrophysics of Galaxies Exoplanet Accretion (astrophysics) Stars [SDU]Sciences of the Universe [physics] 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astronomical Journal The Astronomical Journal, American Astronomical Society, 2021, 161 (2), pp.54. ⟨10.3847/1538-3881/abcc60⟩ |
| ISSN: | 1538-3881 0004-6256 |
| DOI: | 10.3847/1538-3881/abcc60 |
| Popis: | We present an adaptive optics (AO) analysis of images from the Keck-II telescope NIRC2 instrument of the planetary microlensing event MOA-2009-BLG-319. The $\sim$10 year baseline between the event and the Keck observations allows the planetary host star to be detected at a separation of $66.5\pm 1.7\,$mas from the source star, consistent with the light curve model prediction. The combination of the host star brightness and light curve parameters yield host star and planet masses of M_host = 0.514 $\pm$ 0.063M_Sun and m_p = 66.0 $\pm$ 8.1M_Earth at a distance of $D_L = 7.0 \pm 0.7\,$kpc. The star-planet projected separation is $2.03 \pm 0.21\,$AU. The planet-star mass ratio of this system, $q = (3.857 \pm 0.029)\times 10^{-4}$, places it in the predicted "planet desert" at $10^{-4} < q < 4\times 10^{-4}$ according to the runaway gas accretion scenario of the core accretion theory. Seven of the 30 planets in the Suzuki et al. (2016) sample fall in this mass ratio range, and this is the third with a measured host mass. All three of these host stars have masses of 0.5 $\leq$ M_host/M_Sun $\leq$ 0.7, which implies that this predicted mass ratio gap is filled with planets that have host stars within a factor of two of 1M_Sun. This suggests that runaway gas accretion does not play a major role in determining giant planet masses for stars somewhat less massive than the Sun. Our analysis has been accomplished with a modified DAOPHOT code that has been designed to measure the brightness and positions of closely blended stars. This will aid in the development of the primary method that the Nancy Grace Roman Space Telescope mission will use to determine the masses of microlens planets and their hosts. 16 pages, 6 figures, AJ in press |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|