Search Publications
LBT transmission spectroscopy of HAT-P-12b. Confirmation of a cloudy atmosphere with no significant alkali features
Mallonn, M.; Reiners, A.; Apai, D. +10 more
The hot sub-Saturn-mass exoplanet HAT-P-12b is an ideal target for transmission spectroscopy because of its inflated radius. We observed one transit of the planet with the multi-object double spectrograph (MODS) on the Large Binocular Telescope (LBT) with the binocular mode and obtained an atmosphere transmission spectrum with a wavelength coverag…
An Observationally Constrained Analytical Model for Predicting the Magnetic Field Vectors of Interplanetary Coronal Mass Ejections at 1 au
Gopalswamy, Nat; Srivastava, Nandita; Sarkar, Ranadeep
We report on an observationally constrained analytical model, the INterplanetary Flux ROpe Simulator (INFROS), for predicting the magnetic field vectors of coronal mass ejections (CMEs) in the interplanetary medium. The main architecture of INFROS involves using the near-Sun flux rope properties obtained from the observational parameters that are …
A radio polarimetric study to disentangle AGN activity and star formation in Seyfert galaxies
O'Dea, C. P.; Baum, S. A.; Kharb, P. +2 more
To understand the origin of radio emission in radio-quiet active galactic nucleus (AGN) and differentiate between the contributions from star formation, AGN accretion, and jets, we have observed a nearby sample of Seyfert galaxies along with a comparison sample of starburst galaxies using the Expanded Very Large Array (EVLA) in full-polarization m…
The Most Metal-poor Stars in the Inner Bulge
Casey, Andrew R.; Ji, Alexander P.; Reggiani, Henrique +1 more
The bulge is the oldest component of the Milky Way. Since numerous simulations of Milky Way formation have predicted that the oldest stars at a given metallicity are found on tightly bound orbits, the Galaxy's oldest stars are likely metal-poor stars in the inner bulge with small apocenters (i.e., Rapo ≲ 4 kpc). In the past, stars with …
A stellar census in globular clusters with MUSE. Extending the CaT-metallicity relation below the horizontal branch and applying it to multiple populations
Brinchmann, Jarle; Weilbacher, Peter M.; Kamann, Sebastian +7 more
Aims: We use the spectra of more than 30 000 red giant branch (RGB) stars in 25 globular clusters (GC), obtained within the MUSE survey of Galactic globular clusters, to calibrate the Ca II triplet metallicity relation and derive metallicities for all individual stars. We investigate the overall metallicity distributions as well as those of t…
Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
Fox, O. D.; Zhang, X.; Reichart, D. E. +46 more
We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope frequently, with four clear slope changes in the first 30 days of evolution. This rapidly changing light curve indicates that interacti…
High-resolution, 3D radiative transfer modelling. IV. AGN-powered dust heating in NGC 1068
Bianchi, S.; Fritz, J.; Galliano, F. +18 more
The star formation rate and the mass of interstellar medium (ISM) have a high predictive power for the future evolution of a galaxy. Nevertheless, deriving such properties is not straightforward. Dust emission, an important diagnostic of star formation and ISM mass throughout the Universe, can be powered by sources unrelated to ongoing star format…
Molecule-dependent oxygen isotopic ratios in the coma of comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +9 more
The ratios of the three stable oxygen isotopes 16O, 17O, and 18O on the Earth and, as far as we know in the Solar system, show variations on the order of a few per cent at most, with a few outliers in meteorites. However, in the interstellar medium there are some highly fractionated oxygen isotopic ratios in some s…
The Correlation of Outflow Kinematics with Star Formation Rate. VI. Gas Outflows in AGNs
Rakshit, Suvendu; Woo, Jong-Hak; Son, Donghoon
We investigate the connection between ionized gas outflows and star formation activity using a large sample of type 1 and 2 active galactic nuclei (AGNs) with far-infrared detections or star formation rate (SFR) estimates. The strength of ionized gas outflows, measured by the velocity dispersion and velocity shift of the [O III] emission line, cle…
CMZoom. II. Catalog of Compact Submillimeter Dust Continuum Sources in the Milky Way's Central Molecular Zone
Ho, Luis C.; Ott, Jürgen; Lu, Xing +19 more
In this paper we present the CMZoom survey's catalog of compact sources (<10″, ∼0.4 pc) within the central molecular zone (CMZ). CMZoom is a Submillimeter Array large program designed to provide a complete and unbiased map of all high column density gas (N(H2) ≥ 1023 cm-2) of the innermost 500 pc of the Galaxy i…