The GRAVITY young stellar object survey III. The dusty disk of RY Lup
Abstract
We use PIONIER data from the ESO archive and GRAVITY data that were obtained in June 2017 with the four 8m telescopes. We use a parametric disk model and the 3D radiative transfer code MCFOST to reproduce the Spectral Energy Distribution and match the interferometric observations. To match the SED , our model requires a stellar luminosity of 2.5 Lsun, higher than any previously determined values. Such a high value is needed to accommodate the circumstellar extinction caused by the highly inclined disk, which has been neglected in previous studies. While using an effective temperature of 4800 K determined through high-resolution spectroscopy, we derive a stellar radius of 2.29 Rsun. These revised fundamental parameters, when combined with the mass estimates available , lead to an age of 0.5-2.0 Ma for RY Lup, in better agreement with the age of the Lupus association than previous determinations. Our disk model nicely reproduces the interferometric GRAVITY data and is in good agreement with the PIONIER ones. We derive an inner rim location at 0.12~au from the central star. This model corresponds to an inclination of the inner disk of 50deg, which is in mild tension with previous determinations of a more inclined outer disk from SPHERE (70 deg in NIR) and ALMA(67 5 deg) images, but consistent with the inclination determination from the ALMA CO spectra (555deg). Increasing the inclination of the inner disk to 70 deg leads to a higher line-of-sight extinction and therefore requires a higher stellar luminosity of 4.65 Lsun to match the observed flux levels. This luminosity would translate to a stellar radius of 3.13~Rsun, leading to an age of 2-3~Ma, and a stellar mass of about 2 Msun, in disagreement with the observed dynamical mass estimate of 1.3-1.5 Msun. Critically, this high-inclination inner disk model also fails to reproduce the visibilities observed with GRAVITY.
Keywords
Cite
@article{arxiv.2008.08527,
title = {The GRAVITY young stellar object survey III. The dusty disk of RY Lup},
author = {GRAVITY Collaboration and Y. -I. Bouarour and K. Perraut and F. Ménard and W. Brandner and A. Caratti o Garatti and P. Caselli and E. van Dishoeck and C. Dougados and R. Garcia-Lopez and R. Grellmann and T. Henning and L. Klarmann and L. Labadie and A. Natta and J. Sanchez-Bermudez and W. -F. Thi and P. T. de Zeeuw and A. Amorim and M. Bauböck and M. Benisty and J. -P. Berger and Y. Clenet and V. Coudé du Foresto and G. Duvert and A. Eckart and F. Eisenhauer and F. Eupen and M. Filho and F. Gao and P. Garcia and E. Gendron and R. Genzel and S. Gillessen and A. Jiménez-Rosales and L. Jocou and S. Hippler and M. Horrobin and Z. Hubert and P. Kervella and S. Lacour and J. -B. Le Bouquin and P. Léna and T. Ott and T. Paumard and G. Perrin and O. Pfuhl and G. Rousset and S. Scheithauer and J. Shangguan and J. Stadler and O. Straub and C. Straubmeier and E. Sturm and F. H. Vincent and S. D. von Fellenberg and F. Widmann and M. Wiest},
journal= {arXiv preprint arXiv:2008.08527},
year = {2020}
}
Comments
Accepted for publication in A&A; 11 pages, 5 figures, 3 tables