SIMBAD references

2020ApJ...890L..27H - Astrophys. J., 890, L27-L27 (2020/February-3)

Evidence for spin-orbit alignment in the TRAPPIST-1 system.

HIRANO T., GAIDOS E., WINN J.N., DAI F., FUKUI A., KUZUHARA M., KOTANI T., TAMURA M., HJORTH M., ALBRECHT S., HUBER D., BOLMONT E., HARAKAWA H., HODAPP K., ISHIZUKA M., JACOBSON S., KONISHI M., KUDO T., KUROKAWA T., NISHIKAWA J., OMIYA M., SERIZAWA T., UEDA A. and WEISS L.M.

Abstract (from CDS):

In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ=19–15+13°. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Transit photometry - High resolution spectroscopy - Extrasolar rocky planets - Radial velocity

Simbad objects: 5

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2021.06.21-08:55:25

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