The Magellan-TESS Survey I: Survey Description and Mid-Survey Results
Abstract
revealed that roughly one-third of Sun-like stars host planets orbiting within 100 days and between the size of Earth and Neptune. How do these planets form, what are they made of, and do they represent a continuous population or multiple populations? To help address these questions, we began the Magellan-TESS Survey (MTS), which uses Magellan II/PFS to obtain radial velocity (RV) masses of 30 TESS-detected exoplanets and develops an analysis framework that connects observed planet distributions to underlying populations. In the past, small planet RV measurements have been challenging to obtain due to host star faintness and low RV semi-amplitudes, and challenging to interpret due to the potential biases in target selection and observation planning decisions. The MTS attempts to minimize these biases by focusing on bright TESS targets and employing a quantitative selection function and observing strategy. In this paper, we (1) describe our motivation and survey strategy, (2) present our first catalog of planet density constraints for 27 TESS Objects of Interest (TOIs; 22 in our population analysis sample, 12 that are members of the same systems), and (3) employ a hierarchical Bayesian model to produce preliminary constraints on the mass-radius (M-R) relation. We find that the biases causing previous M-R relations to predict fairly high masses at have been reduced. This work can inform more detailed studies of individual systems and offer a framework that can be applied to future RV surveys with the goal of population inferences.
Keywords
Cite
@article{arxiv.2011.11560,
title = {The Magellan-TESS Survey I: Survey Description and Mid-Survey Results},
author = {Johanna Teske and Sharon Xuesong Wang and Angie Wolfgang and Tianjun Gan and Mykhaylo Plotnykov and David J. Armstrong and R. Paul Butler and Bryson Cale and Jeffrey D. Crane and Ward Howard and Eric L. N. Jensen and Nicholas Law and Stephen A. Shectman and Peter Plavchan and Diana Valencia and Andrew Vanderburg and George Ricker and Roland Vanderspek and Dave W. Latham and Sara Seager and Joshua W. Winn and Jon M. Jenkins and Vardan Adibekyan and David Barrado and Susana C. C. Barros and Zouhair Benkhaldoun and David J. A. Brown and Edward M. Bryant and Jennifer Burt and Douglas A. Caldwell and David Charbonneau and Ryan Cloutier and Karen A. Collins and Kevin I. Collins and Nicole D. Colon and Dennis M. Conti and Olivier D. S. Demangeon and Jason D. Eastman and Mohammed Elmufti and Fabo Feng and Erin Flowers and Natalia M. Guerrero and Saeed Hojjatpanah and Jonathan M. Irwin and Giovanni Isopi and Jorge Lillo-Box and Franco Mallia and Bob Massey and Mayuko Mori and Susan E. Mullally and Norio Narita and Taku Nishiumi and Ares Osborn and Martin Paegert and Jerome Pitogo de Leon and Samuel N. Quinn and Michael Reefe and Richard P. Schwarz and Avi Shporer and Abderahmane Soubkiou and Sérgio G. Sousa and Chris Stockdale and Paul A. Strøm and Thiam-Guan Tan and Peter Tenenbaum and Peter J. Wheatley and Justin Wittrock and Daniel A. Yahalomi and Farzaneh Zohrabi},
journal= {arXiv preprint arXiv:2011.11560},
year = {2021}
}
Comments
Minor updates to some masses, and new exploration of broken power law M-R relation. 66 pages (now some figures moved to figure sets, will be in HTML published version). Accepted to ApJS on June 22, 2021