Search Publications
Reconnaissance ultracool spectra in the Euclid Deep Fields
Martín, E. L.; Lodieu, N.; Zhang, J. -Y.
Context. The Euclid spacecraft has been launched and will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telescope will scan repeatedly throughout its mission. The photometric and spectroscopic standards in the EDFs are important benchmarks, c…
The phase-space distribution of the M 81 satellite system
Müller, Oliver; Heesters, Nick; Lelli, Federico +3 more
The spatial distribution of dwarf galaxies around their host galaxies is a critical test for the standard model of cosmology because it probes the dynamics of dark matter halos and is independent of the internal baryonic processes of galaxies. Comoving planes of satellites have been found around the Milky Way, the Andromeda galaxy, and the nearby …
Revealing H2O dissociation in WASP-76 b through combined high- and low-resolution transmission spectroscopy
Madhusudhan, Nikku; Gandhi, Siddharth; Brogi, Matteo +3 more
Numerous chemical constraints have been possible for exoplanetary atmospheres thanks to high-resolution spectroscopy (HRS) from ground-based facilities as well as low-resolution spectroscopy (LRS) from space. These two techniques have complementary strengths, and hence combined HRS and LRS analyses have the potential for more accurate abundance co…
The GRAVITY young stellar object survey. XIII. Tracing the time-variable asymmetric disk structure in the inner AU of the Herbig star HD 98922
Lutz, D.; Genzel, R.; Sturm, E. +52 more
Context. Temporal variability in the photometric and spectroscopic properties of protoplanetary disks is common in young stellar objects. However, evidence pointing toward changes in their morphology over short timescales has only been found for a few sources, mainly due to a lack of high-cadence observations at high angular resolution. Understand…
GOALS-JWST: The Warm Molecular Outflows of the Merging Starburst Galaxy NGC 3256
Inami, Hanae; Böker, Torsten; Togi, Aditya +26 more
We present James Webb Space Telescope (JWST) integral-field spectrograph observations of NGC 3256, a local infrared-luminous late-stage merging system with two nuclei roughly 1 kpc apart, both of which have evidence of cold molecular outflows. Using JWST/NIRSpec and Mid-Infrared Instrument data sets, we investigate this morphologically complex sys…
Joint ALMA/X-ray monitoring of the radio-quiet type 1 active galactic nucleus IC 4329A
Bauer, F. E.; Paltani, S.; Ho, L. C. +20 more
The origin of a compact millimeter (mm, 100–250 GHz) emission in radio-quiet active galactic nuclei (RQ AGN) remains debated. Recent studies propose a connection with self-absorbed synchrotron emission from the accretion disk X-ray corona. We present the first joint ALMA (∼100 GHz) and X-ray (NICER/XMM-Newton/Swift; 2–10 keV) observations of the u…
A Larger Sample Confirms Small Planets around Hot Stars Are Misaligned
Petigura, Erik A.; Winn, Joshua N.; Wang, Songhu +7 more
The distribution of stellar obliquities provides critical insight into the formation and evolution pathways of exoplanets. In the past decade, it was found that hot stars hosting hot Jupiters are more likely to have high obliquities than cool stars, but it is not clear whether this trend exists only for hot Jupiters or holds for other types of pla…
Comparative analysis of the SFR of AGN and non-AGN galaxies, as a function of stellar mass, AGN power, cosmic time, and obscuration
Carrera, F. J.; Masoura, V. A.; Mountrichas, G. +1 more
This study involves a comparative analysis of the star formation rates (SFRs) of active galactic nucleus (AGN) galaxies and non-AGN galaxies and of the SFRs of type 1 and 2 AGNs. To carry out this investigation, we assembled a dataset consisting of 2677 X-ray AGNs detected by the XMM-Newton observatory and a control sample of 64 556 galaxies devoi…
Surface Brightness Fluctuations in Two SPT Clusters: A Pilot Study
Kraft, Ralph; Bulbul, Esra; Romero, Charles E. +10 more
Studies of surface brightness fluctuations in the intracluster medium present an indirect probe of turbulent properties such as the turbulent velocities, injection scales, and the slope of the power spectrum of fluctuations toward smaller scales. With the advancement of Sunyaev–Zel'dovich (SZ) studies and surveys relative to X-ray observations, we…
Chromospheric and coronal heating in an active region plage by dissipation of currents from braiding
De Pontieu, Bart; Hansteen, Viggo; Sainz Dalda, Alberto +3 more
The question of what heats the outer solar atmosphere remains one of the longstanding mysteries in astrophysics. Statistical studies of Sun-like stars reveal a correlation between global chromospheric and coronal emissions, constraining theoretical models of potential heating mechanisms. However, spatially resolved observations of the Sun have sur…