Search Publications
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
Magnetic-field structure of the Crab pulsar wind nebula revealed with IXPE
Weisskopf, Martin C.; Slane, Patrick; Mizuno, Tsunefumi +5 more
We report a detailed study of the magnetic-field structure of the Crab pulsar wind nebula, using the X-ray polarization data in 2-8 keV obtained with the Imaging X-ray Polarimetry Explorer. Contamination of the data for the nebula region by the pulsar emission was removed through application of a stringent pulsation phase cut, extracting a phase r…
Revisiting planetary systems in the Okayama Planet Search Program: A new long-period planet, RV astrometry joint analysis, and a multiplicity-metallicity trend around evolved stars
Izumiura, Hideyuki; Sato, Bun'ei; Yoshida, Michitoshi +15 more
In this study, we revisit 32 planetary systems around evolved stars observed within the framework of the Okayama Planet Search Program (OPSP) and its collaborative framework of the East Asian Planet Search Network to search for additional companions and investigate the properties of stars and giant planets in multiple-planet systems. With our late…
Enlightening the dynamical evolution of Galactic open clusters: an approach using Gaia DR3 and analytical descriptions
Corradi, W. J. B.; Maia, F. F. S.; Angelo, M. S. +1 more
Most stars in our Galaxy form in stellar aggregates, which can become long-lived structures called open clusters (OCs). Along their dynamical evolution, their gradual depletion leave some imprints on their structure. In this work, we employed astrometric, photometric, and spectroscopic data from the Gaia DR3 catalogue to uniformly characterize a s…
Mineralogy of the Venus Surface
Gilmore, Martha S.; Ghail, Richard; Helbert, Jörn +6 more
Surface mineralogy records the primary composition, climate history and the geochemical cycling between the surface and atmosphere. We have not yet directly measured mineralogy on the Venus surface in situ, but a variety of independent investigations yield a basic understanding of surface composition and weathering reactions in the present era whe…
A remarkably stable accretion disc in the Seyfert galaxy MCG-5-23-16
Ingram, Adam; Bianchi, Stefano; Matt, Giorgio +12 more
MCG-5-23-16 is a Seyfert 1.9 galaxy at redshift z = 0.008 49. We analyse here the X-ray spectra obtained with X-ray Multi-Mirror (XMM)-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) data, which are the first contemporaneous observations with these two X-ray telescopes. Two reflection features, producing a narrow core and a broad compone…
BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
Henning, Thomas; Reffert, Sabine; Viswanath, Gayathri +15 more
Recent observations by the B-star Exoplanet Abundance Study (BEAST) illustrate the existence of substellar companions around very massive stars. Here, we present the detection of two lower mass companions to a relatively nearby (148.7−1.3+1.5 pc), young (17−4+3 Myr), bright (V = 6.632 ± 0.006 mag), 2.58 …
Mind the Gap. I. Hα Activity of M Dwarfs Near the Partially/Fully Convective Boundary and a New Hα Emission Deficiency Zone on the Main Sequence
Henry, Todd J.; Paredes, Leonardo A.; Jao, Wei-Chun +4 more
Since identifying the gap in the H-R Diagram (HRD) marking the transition between partially and fully-convective interiors, a unique type of slowly pulsating M dwarf has been proposed. These unstable M dwarfs provide new laboratories in which to understand how changing interior structures can produce potentially observable activity at the surface.…