Search Publications
HST PanCET program: non-detection of atmospheric escape in the warm Saturn-sized planet WASP-29 b
Sanz-Forcada, J.; Ehrenreich, D.; Lecavelier des Etangs, A. +10 more
Short-period gas giant exoplanets are susceptible to intense atmospheric escape due to their large scale heights and strong high-energy irradiation. This process is thought to occur ubiquitously, but to date we have only detected direct evidence of atmospheric escape in hot Jupiters and warm Neptunes. The latter planets are particularly more sensi…
Detection of H2O and OH+ in z > 3 hot dust-obscured galaxies
Knudsen, K. K.; Aalto, S.; Falstad, N. +3 more
Aims: In this paper we present the detection of H2O and OH+ emission in z > 3 hot dust-obscured galaxies (Hot DOGs).
Methods: Using ALMA Band-6 observations of two Hot DOGs, we detected H2O(202 - 111) in W0149+2350, and H2O(312 - 303) and the multi…
The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert
Cifuentes, C.; Roca-Fàbrega, S.; Llorente de Andrés, F. +2 more
We investigate two topics regarding solar mass FGK-type stars, the lithium-rotation connection (LRC), and the existence of the `lithium desert'. We determine the minimum critical rotation velocity (v sin i), related with the LRC separating slow from rapid stellar rotators, to be 5 km s−1. This value also splits different stellar propert…
Solar Orbiter observations of an ion-scale flux rope confined to a bifurcated solar wind current sheet
Eastwood, J. P.; Lavraud, B.; Horbury, T. S. +10 more
Context. Flux ropes in the solar wind are a key element of heliospheric dynamics and particle acceleration. When associated with current sheets, the primary formation mechanism is magnetic reconnection and flux ropes in current sheets are commonly used as tracers of the reconnection process.
Aims: Whilst flux ropes associated with reconnectin…
Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3
Liu, N.; Zhu, Z.; Liu, J. -C. +5 more
Context. Comparisons of optical positions derived from the Gaia mission and radio positions measured by very long baseline interferometry (VLBI) probe the structure of active galactic nuclei (AGN) on the milliarcsecond scale. So far, these comparisons have focused on using the S∕X-band (2/8 GHz) radio positions, but did not take advantage of the V…
KMT-2018-BLG-1743: planetary microlensing event occurring on two source stars
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: We present the analysis of the microlensing event KMT-2018-BLG-1743. The analysis was conducted as a part of the project, in which previous lensing events detected in and before the 2019 season by the KMTNet survey were reinvestigated with the aim of finding solutions of anomalous events with no suggested plausible models.
Methods:…
Blanco DECam Bulge Survey (BDBS). III. A new view of the double red clump in the Milky Way bulge through luminosity and color distribution
Rich, R. M.; Vivas, A. K.; Pilachowski, C. A. +9 more
Red clump (RC) stars are one of the best stellar tracers of the structure of the Milky Way (MW) bulge. Here we report a new view of the double RC through luminosity and color distributions of RC stars in nine bulge fields (l = 0.0°, ±4.5°; b = -6.0°, -7.5°, -9.0°) from the Blanco DECam Bulge Survey (BDBS), which covers near-ultraviolet to near-inf…
Variation of the core lifetime and fragmentation scale in molecular clouds as an indication of ambipolar diffusion
André, Philippe; Das, Indrani; Basu, Shantanu
Ambipolar diffusion likely plays a pivotal role in the formation and evolution of dense cores in weakly ionized molecular clouds. Linear analyses show that the evolutionary times and fragmentation scales are significantly greater than the hydrodynamic (Jeans) values even for clouds with mildly supercritical mass-to-flux ratios. We use values of fr…
Eight more low luminosity globular clusters in the Sagittarius dwarf galaxy
Minniti, D.; Saito, R. K.; Alonso-García, J. +2 more
Context. The Sagittarius (Sgr) dwarf galaxy is merging with the Milky Way, and the study of its globular clusters (GCs) is important to understand the history and outcome of this ongoing process.
Aims: Our main goal is to characterize the GC system of the Sgr dwarf galaxy. This task is hampered by high foreground stellar contamination, mostly…
Penumbral decay observed in active region NOAA 12585
Guglielmino, S. L.; Romano, P.; Rouppe van der Voort, L. H. M. +3 more
Context. The physical conditions leading the sunspot penumbra decay are poorly understood so far.
Aims: We investigate the photospheric magnetic and velocity properties of a sunspot penumbra during the decay phase to advance the current knowledge of the conditions leading to this process.
Methods: A penumbral decay was observed with the …