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Title: RADIAL VELOCITY OBSERVATIONS AND LIGHT CURVE NOISE MODELING CONFIRM THAT KEPLER-91b IS A GIANT PLANET ORBITING A GIANT STAR

Kepler-91b is a rare example of a transiting hot Jupiter around a red giant star, providing the possibility to study the formation and composition of hot Jupiters under different conditions compared to main-sequence stars. However, the planetary nature of Kepler-91b, which was confirmed using phase-curve variations by Lillo-Box et al., was recently called into question based on a re-analysis of Kepler data. We have obtained ground-based radial velocity observations from the Hobby-Eberly Telescope and unambiguously confirm the planetary nature of Kepler-91b by simultaneously modeling the Kepler and radial velocity data. The star exhibits temporally correlated noise due to stellar granulation which we model as a Gaussian Process. We hypothesize that it is this noise component that led previous studies to suspect Kepler-91b to be a false positive. Our work confirms the conclusions presented by Lillo-Box et al. that Kepler-91b is a 0.73 ± 0.13 M {sub Jup} planet orbiting a red giant star.
Authors:
; ; ;  [1] ; ; ;  [2] ;  [3]
  1. NASA Ames Research Center, M/S 244-30, Moffett Field, CA 94035 (United States)
  2. McDonald Observatory, The University of Texas at Austin, Austin, TX 78712 (United States)
  3. New York University, Center for Cosmology and Particle Physics, New York, NY 10003 (United States)
Publication Date:
OSTI Identifier:
22364233
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 800; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DATA ANALYSIS; DIAGRAMS; GAUSSIAN PROCESSES; JUPITER PLANET; MAIN SEQUENCE STARS; NOISE; RADIAL VELOCITY; RED GIANT STARS; TELESCOPES; VARIATIONS; VISIBLE RADIATION