382 datasets found

SPIRou is a near-infrared spectropolarimeter and a high-precision velocimeter. The SPIRou Legacy Survey collected data from February 2019 to June 2022, half of the time devoted...

We present the serendipitous discovery of 8 distant (>50pc) late M dwarfs with plausible associated radio emission at 144MHz. The M dwarf nature of our sources has been...

The hydrogen Paschen lines are known activity indicators, but studies of them in M dwarfs during quiescence are as rare as their reports in flare studies. This situation is...

The main scientific goal of TESS is to find planets smaller than Neptune around stars that are bright enough to allow for further characterization studies. Given our current...

With the growth of comparative exoplanetology, it is increasingly clear that the relationship between inner and outer planets plays a key role in unveiling the mechanisms...

One clear manifestation of dynamo action on the Sun is the 22-yr magnetic cycle, exhibiting a polarity reversal and a periodic conversion between poloidal and toroidal fields....

M dwarfs are active stars that exhibit variability in chromospheric emission and photometry at short and long timescales, including long cycles that are related to dynamo...

We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (d~6.25pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey. We...

The search for extrasolar planets around the nearest M dwarfs is a crucial step toward identifying the nearest Earth-like planets. One of the main challenges in this search is...

We present radial velocity follow-up obtained with ESPRESSO of the M-type star LTT 1445A (TOI-455), for which a transiting planet b with an orbital period of 5.4 days was...

The large amounts of astrophysical data being provided by existing and future instrumentation require efficient and fast analysis tools. Transfer learning is a new technique...

Different approaches have been adopted to study both short- and long-term stellar magnetic activity, and although the mechanisms by which low-mass stars generate large-scale...

Low- and intermediate-mass asymptotic giant stars and massive red supergiant stars are important contributors to the chemical enrichment of the Universe. They are among the most...

Detecting a planetary companion in a short-period orbit through radio emission from the interaction with its host star is a new prospect in exoplanet science. A tantalising...

We present the discovery of an Earth-mass planet (M_b_sini=1.36+/-0.21M_{Earth}) on a 15.6d orbit of a relatively nearby (d~9.6pc) and low-mass (0.167+/-0.011M{sun}) M5.0V star,...

The CARMENES instrument, installed at the 3.5-m telescope of the Calar Alto observatory in Almeria, Spain, was conceived to deliver high-accuracy radial velocity (RV)...

A challenge with radial-velocity (RV) data is disentangling the origin of signals either due to a planetary companion or to stellar activity. Obtaining data over a large time...

For a sample of 404 F- to M-type stars we created the largest sample of simultaneous X-ray and CaII H & K observations of late-type stars obtained so far to study the...

The strong KI doublet near 7700{AA} and another doublet near 12500{AA} are studied in a sample of 324 M dwarfs using CARMENES spectra. For the optical doublet we use only the...

Stellar activity poses one of the main obstacles for the detection and characterisation of small exoplanets around cool stars, as it can induce radial velocity (RV) signals that...