HERMES high-resolution spectroscopy of HD 149382. Where did the planet go?
V.A. Jacobs, R.H. {\O}stensen, H. Van Winckel, S. Bloemen, P.I., P\'apics, G. Raskin, J. Debosscher, S. Uttenthaler, E. Van Aarle, C., Waelkens, E. Bauwens, T. Verhoelst, C. Gielen, H. Lehmann, R. Oreiro
TL;DR
This study used high-resolution spectroscopy to investigate the claimed substellar companion orbiting HD 149382, but found no evidence supporting its existence within the measurement precision.
Contribution
The paper provides a high-precision radial velocity analysis that refutes previous claims of a planetary companion around HD 149382.
Findings
No significant radial velocity variations detected.
Ruled out companions with amplitudes >0.79 km/s for periods <50 days.
High-resolution spectroscopy confirms absence of the proposed planet.
Abstract
A close substellar companion has been claimed to orbit the bright sdB star HD 149382 with a period of 2.391d. In order to check this important discovery we gathered 26 high resolution spectra over 55 days with the HERMES spectrograph on the 1.2m Mercator telescope on La Palma, and analyzed the resulting radial velocities. Our data show no sign of any significant radial-velocity periodicities, and from the high precision of our measurements we rule out any RV variations with amplitudes higher than 0.79 km/s on periods shorter than 50 days.
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