Search Publications
TIC 168789840: A Sextuply Eclipsing Sextuple Star System
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +48 more
We report the discovery of a sextuply eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during Cycle 1, with lightcurves extracted from TESS Full Frame Image data. It was also previously observ…
CLASH-VLT: Abell S1063. Cluster assembly history and spectroscopic catalogue
Rodighiero, G.; Demarco, R.; Gruen, D. +31 more
Context. The processes responsible for galaxy evolution in different environments as a function of galaxy mass remain heavily debated. Rich galaxy clusters are ideal laboratories in which to distinguish the role of environmental versus mass quenching because they consist of a full range of galaxies and environments.
Aims: Using the CLASH-VLT …
A spectral survey of WASP-19b with ESPRESSO
MacDonald, Ryan J.; Brahm, Rafael; Sánchez-López, Alejandro +10 more
High-resolution precision spectroscopy provides a multitude of robust techniques for probing exoplanetary atmospheres. We present multiple VLT/ESPRESSO transit observations of the hot-Jupiter exoplanet WASP-19b with previously published but disputed atmospheric features from low resolution studies. Through spectral synthesis and modelling of the R…
Galactic potential constraints from clustering in action space of combined stellar stream data
Sharma, Sanjib; Helmi, Amina; Koppelman, Helmer H. +4 more
Stream stars removed by tides from their progenitor satellite galaxy or globular cluster act as a group of test particles on neighbouring orbits, probing the gravitational field of the Milky Way. While constraints from individual streams have been shown to be susceptible to biases, combining several streams from orbits with various distances reduc…
A major asymmetric ice trap in a planet-forming disk. II. Prominent SO and SO2 pointing to C/O < 1
Booth, Alice S.; van Dishoeck, Ewine F.; Leemker, Margot +2 more
Gas-phase sulphur-bearing volatiles appear to be severely depleted in protoplanetary disks. The detection of CS and the non-detections of SO and SO2 in many disks have shown that the gas in the warm molecular layer, where giant planets accrete their atmospheres, has a high C/O ratio. In this Letter, we report the detection of SO and SO<…
Coronal Hole Detection and Open Magnetic Flux
Temmer, Manuela; Vršnak, Bojan; Pinto, Rui F. +14 more
Many scientists use coronal hole (CH) detections to infer open magnetic flux. Detection techniques differ in the areas that they assign as open, and may obtain different values for the open magnetic flux. We characterize the uncertainties of these methods, by applying six different detection methods to deduce the area and open flux of a near-disk …
Assessing the sources of reionization: a spectroscopic case study of a 30× lensed galaxy at z 5 with Lyα, C IV, Mg II, and [Ne III]
Richard, Johan; Maiolino, Roberto; Massey, Richard +5 more
We present a detailed spectroscopic analysis of a galaxy at z ≃ 4.88 that is, by chance, magnified ~30× by gravitational lensing. Only three sources at z ≳ 5 are known with such high magnification. This particular source has been shown to exhibit widespread, high equivalent width ${{\rm C\, \small {IV}}}\ \lambda 1549\, \mathring{\rm A}$ emission,…
Strong toroidal magnetic fields required by quiescent X-ray emission of magnetars
Igoshev, Andrei P.; Hollerbach, Rainer; Wood, Toby +1 more
Magnetars are neutron stars (NSs) with extreme magnetic fields1 of strength 5 × 1013-1015 G. These fields are generated by dynamo action during the proto-NS phase, and are expected to have both poloidal and toroidal components2-6, although the energy of the toroidal component could be ten times larger
A Massive Quiescent Galaxy Confirmed in a Protocluster at z = 3.09
Tamura, Yoichi; Kohno, Kotaro; Steidel, Charles C. +10 more
We report a massive quiescent galaxy at ${z}_{\mathrm{spec}}={3.0922}_{-0.004}^{+0.008}$ spectroscopically confirmed at a protocluster in the SSA22 field by detecting the Balmer and Ca II absorption features with the multi-object spectrometer for infrared exploration on the Keck I telescope. This is the most distant quiescent galaxy confirmed in a…
Chamaeleon DANCe. Revisiting the stellar populations of Chamaeleon I and Chamaeleon II with Gaia-DR2 data
Bertin, E.; Miret-Roig, N.; Bouy, H. +6 more
Context. Chamaeleon is the southernmost low-mass star-forming complex within 200 pc from the Sun. Its stellar population has been extensively studied in the past, but the current census of the stellar content is not complete yet and deserves further investigation.
Aims: We take advantage of the second data release of the Gaia space mission to…