Retired a stars and their companions. VII. 18 new Jovian planets

John Asher Johnson, Christian Clanton, Andrew W. Howard, Brendan P. Bowler, Gregory W. Henry, Geoffrey W. Marcy, Justin R. Crepp, Michael Endl, William D. Cochran, Phillip J. MacQueen, Jason T. Wright, Howard Isaacson

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

We report the detection of 18 Jovian planets discovered as part of our Doppler survey of subgiant stars at Keck Observatory, with follow-up Doppler and photometric observations made at McDonald and Fairborn Observatories, respectively. The host stars have masses 0.927 ≤ M/M ≤ 1.95, radii 2.5 ≤ R/R ≤ 8.7, and metallicities -0.46 ≤ [Fe/H] ≤+0.30. The planets have minimum masses 0.9 M Jup ≤ MP sin i ≲ 13 M Jup and semimajor axes a ≥ 0.76 AU. These detections represent a 50% increase in the number of planets known to orbit stars more massive than 1.5 M and provide valuable additional information about the properties of planets around stars more massive than the Sun.

Original languageEnglish (US)
Article number26
JournalAstrophysical Journal, Supplement Series
Volume197
Issue number2
DOIs
StatePublished - Dec 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Johnson, J. A., Clanton, C., Howard, A. W., Bowler, B. P., Henry, G. W., Marcy, G. W., Crepp, J. R., Endl, M., Cochran, W. D., MacQueen, P. J., Wright, J. T., & Isaacson, H. (2011). Retired a stars and their companions. VII. 18 new Jovian planets. Astrophysical Journal, Supplement Series, 197(2), [26]. https://doi.org/10.1088/0067-0049/197/2/26