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A dynamical mass for GJ 463 b: A massive super-Jupiter companion beyond the snow line of a nearby M dwarf
Sozzetti, A.
We determined the full orbital architecture and true mass of the recently Doppler-detected long-period giant planet GJ 463 b using the HIPPARCOS-Gaia proper motion anomaly in combination with the available radial velocities, constraints from the knowledge of the spectroscopic orbital parameters, and supplementary information from a sensitivity ana…
Sub-mm/mm optical properties of real protoplanetary matter derived from Rosetta/MIRO observations of comet 67P
Blum, Jürgen; Gundlach, Bastian; Wolf, Sebastian +6 more
Optical properties are required for the correct understanding and modelling of protoplanetary and debris discs. By assuming that comets are the most pristine bodies in the Solar system, our goal is to derive optical constants of real protoplanetary material. We determine the complex index of refraction of the near-surface material of comet 67P/Chu…
An investigation of the '10 keV feature' in the spectra of accretion powered X-ray pulsars with NuSTAR
Paul, Biswajit; Rana, Vikram; Manikantan, Hemanth
Some of the accreting X-ray pulsars are reported to exhibit a peculiar spectral feature at ~10 keV, known as the '10 keV feature'. The feature has been characterized as either an emission line or an absorption line, and its origin is unknown. It has been found in multiple observations of the same source by different observatories, but not all the …
On the gamma-ray emission from the core of the Sagittarius dwarf galaxy
Linden, Tim; Pace, Andrew B.; Strigari, Louis E. +5 more
We use Fermi-LAT data to analyse the faint gamma-ray source located at the centre of the Sagittarius (Sgr) dwarf spheroidal galaxy. In the 4FGL-DR3 catalogue, this source is associated with the globular cluster, M54. We investigate the spectral energy distribution and spatial extension of this source, with the goal of testing two hypotheses: (1) t…
Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c
Crowther, P. A.; Bostroem, K. A.; Sander, A. A. C. +5 more
Context. The upper stellar mass limit is a fundamental parameter for simulations of star formation, galactic chemical evolution, and stellar feedback. An empirical bound on this parameter is therefore highly valuable. The most massive stars known to date are R 136 a1, a2, a3, and c, with reported masses in excess of 150-200 M⊙ and initi…
BASS-XL: X-ray variability properties of unobscured active galactic nuclei
Kawamuro, Taiki; Ricci, Claudio; Bauer, Franz E. +15 more
We investigate the X-ray variability properties of Seyfert 1 Galaxies belonging to the BAT AGN Spectroscopic Survey (BASS). The sample includes 151 unobscured (NH < 1022 cm-2) AGNs observed with XMM-Newton for a total exposure time of ~27 ms, representing the deepest variability study done so far with high signa…
Clustering of magnetic reconnection exhausts in the solar wind: An automated detection study
Rouillard, Alexis P.; Phan, Tai D.; Louarn, Philippe +9 more
Context. Magnetic reconnection is a fundamental process in astrophysical plasmas that enables the dissipation of magnetic energy at kinetic scales. Detecting this process in situ is therefore key to furthering our understanding of energy conversion in space plasmas. However, reconnection jets typically scale from seconds to minutes in situ, and as…
Apocenter pileup and arcs: A narrow dust ring around HD 129590
Bayo, A.; Henning, Th.; Milli, J. +6 more
Context. Observations of debris disks have significantly improved over the past decades, both in terms of sensitivity and spatial resolution. At near-infrared wavelengths, new observing strategies and post-processing algorithms allow us to drastically improve the final images and reveal faint structures in the disks. These structures inform us abo…
TESS Spots a Super-puff: The Remarkably Low Density of TOI-1420b
López-Morales, Mercedes; Bieryla, Allyson; Latham, David W. +51 more
We present the discovery of TOI-1420b, an exceptionally low-density (ρ = 0.08 ± 0.02 g cm-3) transiting planet in a P = 6.96 days orbit around a late G-dwarf star. Using transit observations from TESS, LCOGT, Observatoire Privé du Mont, Whitin, Wendelstein, OAUV, Ca l'Ou, and KeplerCam, along with radial velocity observations from HARPS…
Massive Star Formation in the Tarantula Nebula
Hirschauer, Alec S.; Lebouteiller, Vianney; Lee, Min-Young +17 more
In this work, we present 299 candidate young stellar objects (YSOs) in 30 Doradus discovered using Spitzer and Herschel point-source catalogs, 276 of which are new. We study the parental giant molecular clouds in which these YSO candidates form using recently published Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 7 observations of