C. J. Marvin

Absolute Ca II H & K and H-alpha flux measurements of low-mass stars: Extending R′HK to M dwarfs

C. J. Marvin, A. Reiners, G. Anglada‐Escudé, S. V. Jeffers et autres

Context. With the recent surge of planetary surveys focusing on detecting Earth-mass planets around M dwarfs, it is becoming more important to understand chromospheric activity in M dwarfs. Stellar chromospheric calcium emission is typically measured using the R′HK calibrations of Noyes et …

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VizieR Online Data Catalog: GJ 3512 radial velocity and light curves (Morales+, 2019)

J. C. Morales, Alexander J. Mustill, I. Ribas, M. B. Davies et autres

The CARMENES search for exoplanets around M dwarfs

M. Zechmeister, S. Dreizler, I. Ribas, A. Reiners et autres

Context. Teegarden’s Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0 V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as …

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The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star

M. Zechmeister, S. Dreizler, I. Ribas, A. Reiners et autres

Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES. …

VizieR Online Data Catalog: Teegarden's Star RV and Hα curves (Zechmeister+, 2019)

M. Zechmeister, M. Dreizler, I. Ribas, A. Reiners et autres

A giant exoplanet orbiting a very-low-mass star challenges planet formation models

J. C. Morales, Alexander J. Mustill, I. Ribas, M. B. Davies et autres

Surveys have shown that super-Earth and Neptune-mass exoplanets are more frequent than gas giants around low-mass stars, as predicted by the core accretion theory of planet formation. We report the discovery of a giant planet around the very-low-mass star GJ 3512, as …

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VizieR Online Data Catalog: Photometry & RV follow-up observations of K2-18 (Sarkis+, 2018)

P. Sarkis, Thomas Henning, M. Kürster, Trifon Trifonov et autres

VizieR Online Data Catalog: Cool stars cChromospheric activity catalog (Boro Saikia+, 2018)

S. Boro Saikia, C. J. Marvin, S. V. Jeffers, A. Reiners et autres

CRIRES+ on its way to VLT (Conference Presentation)

Roman Follert, Reinhold J. Dorn, Anna Brucalassi, Paul Bristow et autres

The CRIRES upgrade project (CRIRES+) will improve the performance and observing efficiency of the successful adaptive optics (AO) assisted CRIRES instrument. CRIRES was in operation from 2006 to 2014 at the 8m UT1 (Unit Telescope) of the Very Large Telescope (VLT, Cerro …

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CARMENES: high-resolution spectra and precise radial velocities in the red and infrared

A. Quirrenbach, P. J. Amado, I. Ribas, J. A. Caballero et autres

The design and construction of CARMENES has been presented at previous SPIE conferences. It is a next-generation radial-velocity instrument at the 3.5m telescope of the Calar Alto Observatory, which was built by a consortium of eleven Spanish and German institutions. CARMENES consists …

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Full system test and early preliminary acceptance Europe results for CRIRES+

Reinhold J. Dorn, Roman Follert, A. P. Hatzes, Paul Bristow et autres

CRIRES+ is the new high-resolution NIR echelle spectrograph intended to be operated at the platform B of VLT Unit telescope UT3. It will cover from Y to M bands (0.95-5.3um) with a spectral resolution of R = 50000 or R=100000. The main …

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VizieR Online Data Catalog: 324 CARMENES M dwarfs velocities (Reiners+, 2018)

A. Reiners, M. Zechmeister, J. A. Caballero, I. Ribas et autres