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The A-shell star Phi Leo revisited: its photospheric and circumstellar spectra
C. Eiroa, B. Montesinos, I. Rebollido +7
Variable red- and blue-shifted absorption features observed in the Ca ii K line towards the A-type shell star Leo have been suggested by us in a previous work to be likely due…
Exocomets: A spectroscopic survey
I. Rebollido, C. Eiroa, B. Montesinos +18
While exoplanets are now routinely detected, the detection of small bodies in extrasolar systems remains challenging. Since the discovery of sporadic events interpreted as exocomet…
Incidence of debris discs around FGK stars in the solar neighbourhood
B. Montesinos, C. Eiroa, A. V. Krivov +16
Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their solar system's counterparts are the asteroid and Edgew…
ALMA observations of alpha Centauri: First detection of main-sequence stars at 3mm wavelength
R. Liseau, W. Vlemmings, A. Bayo +19
The precise mechanisms that provide the non-radiative energy for heating the chromosphere and the corona of the Sun and those of other stars constitute an active field of research.…
Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations
M. Aberasturi, A. J. Burgasser, A. Mora +4
We used HST/WFC3 observations of a sample of 26 nearby (20 pc) mid to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs. Ti…
How dusty is alpha Centauri? Excess or non-excess over the infrared photospheres of main-sequence stars
J. Wiegert, R. Liseau, P. Thébault +19
[Abridged] Debris discs around main-sequence stars indicate the presence of larger rocky bodies. The components of the nearby binary aCentauri have higher than solar metallicities,…