Search Publications
Short-term variability of the transitional pulsar candidate CXOU J110926.4‑650224 from X-rays to infrared
D'Avanzo, P.; Campana, S.; de Martino, D. +14 more
CXOU J110926.4‑650224 is a candidate transitional millisecond pulsar (tMSP) with X-ray and radio emission properties reminiscent of those observed in confirmed tMSPs in their X-ray 'subluminous' disc state. We present the results of observing campaigns that, for the first time, characterise the optical and near-infrared variability of this source …
Disentangling the dust and gas contributions of the JWST/MIRI spectrum of Sz 28
Woitke, P.; Kamp, I.; Min, M. +2 more
Context. Recent spectra of protoplanetary disks around very low-mass stars (VLMS), captured by the Mid-InfraRed Instrument (MIRI) on board the James Webb Space Telescope (JWST), reveal a rich carbon chemistry. Current interpretations of these spectra are based on 0D slab models and provide valuable estimates for molecular emission temperatures and…
The K2-24 planetary system revisited by CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
The planetary system K2-24 is composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large transit time variations (TTVs), and it is an excellent laboratory to search for signatures of planetary migration. Previous studies performed with K2, Spitzer, and RV data tentatively claimed a significant non…
Astrometric and photometric characterization of η Tel B combining two decades of observations
Milli, J.; Zurlo, A.; Langlois, M. +11 more
Context. η Tel is an 18 Myr system composed of a 2.09 M⊙ A-type star with an M7-M8 brown dwarf companion, η Tel B. The two objects have a projected separation of 4″.2 (~208 au). This system has been targeted by high-contrast imaging campaigns for over 20 yr, facilitating its orbital and photometric characterization. The companion, η Tel…
First resolved stellar halo kinematics of a Milky Way-mass galaxy outside the Local Group: The flat counter-rotating halo in NGC 4945
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +6 more
The stellar halos of galaxies, primarily formed through the accretion and merger of smaller objects, are an important tool for understanding the hierarchical mass assembly of galaxies. However, the inner regions of stellar halos in disk galaxies are predicted to have an in situ component that is expected to be prominent along the major axis. Kinem…
Magnetic activity of radio stars based on TESS and LAMOST surveys
Zhang, Liyun; Han, Xianming L.; Misra, Prabhakar +2 more
Aims: Stellar flares serve as crucial indicators stellar magnetic activity. Radio emissions were detectable across all stages of stellar evolution. We define radio stars in our paper as stars with radio continuum emission in the frequency region of about 1.4-375 GHz from the catalog published by Wendker (1995, A&AS, 109, 177; 2015, VizieR…
RedDots: Limits on habitable and undetected planets orbiting nearby stars GJ 832, GJ 674, and Ross 128
Amado, P. J.; Caballero, J. A.; Reiners, A. +16 more
Context. The nearby (d < 5 pc) M dwarfs GJ 832, GJ 674, and Ross 128 each host a single exoplanet, with Ross 128 b located within the optimistic habitable zone. Due to their low mass and close proximity, these three systems are prime candidates for further characterization studies. Aims. Using HARPS spectroscopic data obtained by the RedDots ca…
The MODEST catalog of depth-dependent spatially coupled inversions of sunspots observed by Hinode/SOT-SP
Solanki, S. K.; Korpi-Lagg, A.; Castellanos Durán, J. S. +3 more
We present a catalog that contains depth-dependent information about the atmospheric conditions inside sunspot groups of all types. The catalog, which we named MODEST, is currently composed of 944 observations of 117 individual active regions with sunspots and covers all types of features observed in the solar photosphere. We used the SPINOR-2D co…
Energy estimation of small-scale jets from the quiet-Sun region
Li, Dong; Ning, Zongjun; Shi, Fanpeng +3 more
Context. Solar jets play a role in coronal heating and the supply of solar wind.
Aims: In this study, we calculate the energies of 23 small-scale jets emerging from a quiet-Sun region in order to investigate their contributions to coronal heating.
Methods: We used data from the High-Resolution Imager (HRI) of the Extreme Ultraviolet Imag…
An analysis of spectroscopic, seismological, astrometric, and photometric masses of pulsating white dwarf stars
Kepler, S. O.; Córsico, Alejandro H.; Uzundag, Murat +3 more
Context. A central challenge in the field of stellar astrophysics lies in accurately determining the mass of stars, particularly when dealing with isolated ones. However, for pulsating white dwarf stars, the task becomes more tractable due to the availability of multiple approaches such as spectroscopy, asteroseismology, astrometry, and photometry…