A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- T. Husser, S. W. Berg, P. Hauschildt
- Physics, Chemistry
- 22 March 2013
Aims. We present a new library of high-resolution synthetic spectra based on the stellar atmosphere code PHOENIX that can be used for a wide range of applications of spectral analysis and stellar…
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
- G. Anglada-Escudé, P. Amado, M. Zechmeister
- PhysicsNature
- 25 August 2016
Observations reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units.
Energy flux determines magnetic field strength of planets and stars
- U. Christensen, V. Holzwarth, A. Reiners
- Physics, GeologyNature
- 8 January 2009
This work reports an extension of a scaling law derived from geodynamo models to rapidly rotating stars that have strong density stratification, and predicts that the field strengths of rapidly rotating brown dwarfs and massive extrasolar planets are high enough to make them observable.
Rotation and differential rotation of active Kepler stars
- T. Reinhold, A. Reiners, G. Basri
- Physics
- 7 August 2013
We present rotation periods for thousands of active stars in the Kepler field derived from Q3 data. In most cases a second period close to the rotation period was detected, which we interpreted as…
Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
- A. Reiners, G. Basri
- Physics
- 7 May 2008
We present results from a high-resolution spectroscopic survey of 45 L dwarfs, which includes both very low mass stars and brown dwarfs. Our spectra allow us to derive a significant number of new…
A VOLUME-LIMITED SAMPLE OF 63 M7–M9.5 DWARFS. II. ACTIVITY, MAGNETISM, AND THE FADE OF THE ROTATION-DOMINATED DYNAMO
- A. Reiners, G. Basri
- Physics
- 21 December 2009
In a volume-limited sample of 63 ultracool dwarfs of spectral type M7–M9.5, we have obtained high-resolution spectroscopy with UVES at the Very Large Telescope and HIRES at Keck Observatory. In this…
EVIDENCE FOR MAGNETIC FLUX SATURATION IN RAPIDLY ROTATING M STARS
- A. Reiners, G. Basri, M. Browning
- Physics
- 28 October 2008
We present magnetic flux measurements in seven rapidly rotating M dwarfs. Our sample stars have X-ray and Hα emission indicative of saturated emission, i.e., emission at a high level, independent of…
The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars
- A. Reiners, G. Basri
- Physics
- 12 October 2006
We present the first direct magnetic field measurements on M dwarfs cooler than spectral class M4.5. Utilizing a new method based on the FeH band near 1 μm, we categorize the integrated surface…
Rotation- and temperature-dependence of stellar latitudinal differential rotation
- A. Reiners
- Physics
- 14 September 2005
More than 600 high resolution spectra of stars with spectral type F and later were obtained in order to search for signatures of differential rotation in line profiles. In 147 stars the rotation law…
THE RADIO ACTIVITY–ROTATION RELATION OF ULTRACOOL DWARFS
- M. McLean, E. Berger, A. Reiners
- Physics
- 1 August 2011
We present a new radio survey of about 100 late-M and L dwarfs undertaken with the Very Large Array. The sample was chosen to explore the role of rotation in the radio activity of ultracool dwarfs.…
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