The Kepler Follow-up Observation Program. II. Stellar Parameters from Medium- and High-resolution Spectroscopy
Year: 2018
Type: article
Abstract: We present results from spectroscopic follow-up observations of stars identified in the Kepler field and carried out by teams of the Kepler Follow-up Observation Program. Two samples of stars were observed over 6 yr (2009–2015): 614 standard stars (divided into “platinum” and “gold” categories) selected based on their asteroseismic detections and 2667 host stars of Kepler Objects of Interest (KOIs), most of them planet candidates. Four data analysis pipelines were used to derive stellar parameters for the observed stars. We compare the T eff, log(g), and [Fe/H] values derived for the same stars by different pipelines; from the average of the standard deviations of the differences in these parameter values, we derive error floors of ∼100 K, 0.2 dex, and 0.1 dex for T eff, log(g), and [Fe/H], respectively. Noticeable disagreements are seen mostly at the largest and smallest parameter values (e.g., in the giant star regime). Most of the log(g) values derived from spectra for the platinum stars agree on average within 0.025 dex (but with a spread of 0.1–0.2 dex) with the asteroseismic log(g) values. Compared to the Kepler Input Catalog (KIC), the spectroscopically derived stellar parameters agree within the uncertainties of the KIC but are more precise and thus an important contribution toward deriving more reliable planetary radii.
Source: The Astrophysical Journal
Authors: E. Furlan, D. R. Ciardi, W. D. Cochran, M. E. Everett, D. W. Latham, G. W. Marcy, L. A. Buchhave, M. Endl, H. Isaacson, E. A. Petigura, T. N. Gautier, D. Huber, A. Bieryla, W. J. Borucki, E. Brugamyer, C. Caldwell, A. Cochran, A. W. Howard, S. B. Howell, M. C. Johnson, P. J. MacQueen, S. N. Quinn, P. Robertson, S. Mathur, N. M. Batalha
Institutions: California Institute of Technology, Infrared Processing and Analysis Center, McDonald Observatory, The University of Texas at Austin, Center for Astrophysics Harvard & Smithsonian, University of California, Berkeley, University of Copenhagen, Natural History Museum of Denmark, Jet Propulsion Laboratory, University of Hawaiʻi at Mānoa, The University of Sydney, University of Hawaii System, Aarhus University, Search for Extraterrestrial Intelligence, Ames Research Center, The Ohio State University, Pennsylvania State University, Space Science Institute, Universidad de La Laguna, Instituto de Astrofísica de Canarias
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2997902650