Search Publications
Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands
Solanki, S. K.; Shapiro, A. I.; Maxted, P. F. L. +4 more
Context. The detection of the first exoplanet paved the way for the era of transit-photometry space missions with revolutionary photometric precision, whose aim is to discover new exoplanetary systems around different types of stars. With this high precision, it is possible to derive the radii of exoplanets very accurately, which is crucial for co…
On the Nature of Ultracool White Dwarfs: Not so Cool after All
Bergeron, P.; Blouin, Simon; Kilic, Mukremin +3 more
A recent analysis of the 100 pc white dwarf sample in the SDSS footprint demonstrated for the first time the existence of a well-defined ultracool-or IR-faint-white dwarf sequence in the Hertzsprung-Russell diagram. Here we take advantage of this discovery to enlarge the IR-faint white dwarf sample threefold. We expand our selection to the entire …
Roaring Storms in the Planetary-mass Companion VHS 1256-1257 b: Hubble Space Telescope Multiepoch Monitoring Reveals Vigorous Evolution in an Ultracool Atmosphere
Kataria, Tiffany; Apai, Dániel; Zhou, Yifan +5 more
The photometric and spectral variability of brown dwarfs probes heterogeneous temperature and cloud distributions and traces the atmospheric circulation patterns. We present a new 42 hr Hubble Space Telescope (HST) Wide Field Camera 3 G141 spectral time series of VHS 1256-1257 b, a late L-type planetary-mass companion that has been shown to have o…
Evidence of a vertical kinematic oscillation beyond the Radcliffe wave
Benjamin, R. A.; Gallagher, J. S., III; Drimmel, R. +5 more
The Radcliffe wave (RW) is a recently discovered sinusoidal vertical feature of dense gas in the proximity of the Sun. In the disk plane, it is aligned with the Local Arm. However, the origin of its vertical undulation is still unknown. This study constrains the kinematics of the RW, using young stars and open clusters as tracers, and explores the…
The Space Density of Ultra-luminous QSOs at the End of Reionization Epoch by the QUBRICS Survey and the AGN Contribution to the Hydrogen Ionizing Background
Grazian, Andrea; Boutsia, Konstantina; Cupani, Guido +6 more
Motivated by evidences favoring a rapid and late hydrogen reionization process completing at z ~ 5.2-5.5 and mainly driven by rare and luminous sources, we have reassessed the estimate of the space density of ultra-luminous QSOs at z ~ 5 in the framework of the QUBRICS survey. A ~ 90% complete sample of 14 spectroscopically confirmed QSOs at M
Orbital Decay in M82 X-2
Israel, Gian Luca; Fürst, Felix; Wilms, Jörn +21 more
M82 X-2 is the first pulsating ultraluminous X-ray source discovered. The luminosity of these extreme pulsars, if isotropic, implies an extreme mass transfer rate. An alternative is to assume a much lower mass transfer rate, but with an apparent luminosity boosted by geometrical beaming. Only an independent measurement of the mass transfer rate ca…
UOCS - VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +4 more
NGC 7789 is a ~1.6 Gyr old, populous open cluster located at ~2000 pc. We characterize the blue straggler stars (BSS) of this cluster using the Ultraviolet (UV) data from the UVIT/AstroSat. We present spectral energy distributions (SED) of 15 BSS candidates constructed using multiwavelength data ranging from UV to IR wavelengths. In 8 BSS candidat…
The Mass-Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH-Grism HST Slitless Spectroscopic Survey
Teplitz, Harry I.; Fan, Xiaohui; Cai, Zheng +9 more
The MAMMOTH-Grism slitless spectroscopic survey is a Hubble Space Telescope (HST) cycle 28 medium program, which is obtaining 45 orbits of WFC3/IR grism spectroscopy in the density peak regions of three massive galaxy protoclusters at z = 2-3 discovered using the MAMMOTH technique. We introduce this survey by presenting the first measurement of th…
Self-absorption in [C II], 12CO, and H I in RCW120. Building up a geometrical and physical model of the region
Schneider, N.; Zavagno, A.; Stutzki, J. +19 more
Aims: Revealing the 3D dynamics of H II region bubbles and their associated molecular clouds and H I envelopes is important for developing an understanding of the longstanding problem as to how stellar feedback affects the density structure and kinematics of the different phases of the interstellar medium.
Methods: We employed observatio…
Combined APOGEE-GALAH stellar catalogues using the Cannon
Lewis, Geraint F.; Wittenmyer, Robert A.; Buder, Sven +21 more
APOGEE and GALAH are two high resolution multi-object spectroscopic surveys that provide fundamental stellar parameters and multiple elemental abundance estimates for about half a million stars in the Milky Way. Both surveys observe in different wavelength regimes and use different data reduction pipelines leading to significant offsets and trends…