Precise infrared radial velocities from keck/nirspec and the search for young planets

John I. Bailey, Russel J. White, Cullen H. Blake, Dave Charbonneau, Travis S Barman, Angelle M. Tanner, Guillermo Torres

Research output: Contribution to journalArticle

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Abstract

We present a high-precision infrared radial velocity (RV) study of late-type stars using spectra obtained with NIRSPEC at the W. M. Keck Observatory. RV precisions of 50ms-1 are achieved for old field mid-M dwarfs using telluric features for wavelength calibration. Using this technique, 20 young stars in the β Pic (age 12Myr) and TW Hya (age 8Myr) Associations were monitored over several years to search for low-mass companions; we also included the chromospherically active field star GJ 873 (EV Lac) in this survey. Based on comparisons with previous optical observations of these young active stars, RV measurements at infrared wavelengths mitigate the RV noise caused by star spots by a factor of 3. Nevertheless, star spot noise is still the dominant source of measurement error for young stars at 2.3 μm, and limits the precision to 77ms-1 for the slowest rotating stars (v sin i < 6kms-1), increasing to 168ms-1 for rapidly rotating stars (v sin i > 12kms-1). The observations reveal both GJ 3305 and TWA 23 to be single-lined spectroscopic binaries; in the case of GJ 3305, the motion is likely caused by its 009 companion, identified after this survey began. The large amplitude, short-timescale variations of TWA 13A are indicative of a hot Jupiter-like companion, but the available data are insufficient to confirm this. We label it as a candidate RV variable. For the remainder of the sample, these observations exclude the presence of any "hot" (P < 3days) companions more massive than 8 M Jup and any "warm" (P < 30days) companions more massive than 17M Jup, on average. Assuming an edge-on orbit for the edge-on disk system AU Mic, these observations exclude the presence of any hot Jupiters more massive than 1.8M Jup or warm Jupiters more massive than 3.9M Jup.

Original languageEnglish (US)
Article number16
JournalAstrophysical Journal
Volume749
Issue number1
DOIs
StatePublished - Apr 10 2012
Externally publishedYes

Fingerprint

radial velocity
planets
planet
stars
Jupiter
Jupiter (planet)
wavelength
old field
star distribution
observatory
young
velocity measurement
wavelengths
calibration
timescale
observatories
orbits

Keywords

  • methods: data analysis
  • planets and satellites: formation
  • stars: pre-main sequence
  • starspots
  • techniques: radial velocities
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Bailey, J. I., White, R. J., Blake, C. H., Charbonneau, D., Barman, T. S., Tanner, A. M., & Torres, G. (2012). Precise infrared radial velocities from keck/nirspec and the search for young planets. Astrophysical Journal, 749(1), [16]. https://doi.org/10.1088/0004-637X/749/1/16

Precise infrared radial velocities from keck/nirspec and the search for young planets. / Bailey, John I.; White, Russel J.; Blake, Cullen H.; Charbonneau, Dave; Barman, Travis S; Tanner, Angelle M.; Torres, Guillermo.

In: Astrophysical Journal, Vol. 749, No. 1, 16, 10.04.2012.

Research output: Contribution to journalArticle

Bailey, John I. ; White, Russel J. ; Blake, Cullen H. ; Charbonneau, Dave ; Barman, Travis S ; Tanner, Angelle M. ; Torres, Guillermo. / Precise infrared radial velocities from keck/nirspec and the search for young planets. In: Astrophysical Journal. 2012 ; Vol. 749, No. 1.
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