Search Publications
Lack of high-mass pre-stellar cores in the starless MDCs of NGC 6334
Zavagno, A.; Louvet, F.; Russeil, D. +6 more
Context. The formation of high-mass stars remains unknown in many aspects. There are two competing families of models to explain the formation of high-mass stars. On the one hand, quasi-static models predict the existence of high-mass pre-stellar cores sustained by a high degree of turbulence. On the other hand, competitive accretion models predic…
Physical properties and transmission spectrum of the WASP-74 planetary system from multiband photometry
Fossati, L.; Burgdorf, M.; Snodgrass, C. +32 more
We present broad-band photometry of 11 planetary transits of the hot Jupiter WASP-74 b, using three medium-class telescopes and employing the telescope-defocusing technique. Most of the transits were monitored through I filters and one was simultaneously observed in five optical (U, g', r', i', z') and three near-infrared (J, H, K) passbands, for …
Evidence of Nonluminous Matter in the Center of M62
Colpi, Monica; Possenti, Andrea; Abbate, Federico +1 more
Theoretical models suggest that intermediate-mass black holes (IMBHs) may form and reside in the centers of globular clusters. IMBHs are still elusive to observations, but the accelerations of pulsars may bring along a unique fingerprint of their presence. In this work, we focus on the pulsars in the globular cluster M62. Using the new distance of…
An ALMA Study of the FU Ori-type Object V900 Mon: Implications for the Progenitor
Dong, Ruobing; Takami, Michihiro; Ábrahám, Péter +13 more
We present ALMA observations of 12CO, 13CO, and C18O J = 2-1 lines and the 230 GHz continuum for the FU Ori-type object (FUor) V900 Mon (d ∼ 1.5 kpc), for which the accretion burst was triggered between 1953 and 2009. We identified CO emission associated with a molecular bipolar outflow extending up to an ∼104…
Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf
Stassun, Keivan G.; Han, Cheongho; Udalski, Andrzej +73 more
We report the discovery of a Spitzer microlensing planet OGLE-2018-BLG-0596Lb, with preferred planet-host mass ratio q ∼ 2 × 10-4. The planetary signal, which is characterized by a short (∼1 day) “bump” on the rising side of the lensing light curve, was densely covered by ground-based surveys. We find that the signal can be explained by…
The M3 project: 2 - Global distributions of mafic mineral abundances on Mars
Bibring, J. -P.; Gondet, B.; Poulet, F. +1 more
A radiative transfer model was used to reproduce several millions of OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) spectra representative of igneous terrains of Mars. This task provided the modal composition and grain sizes at a planetary scale. The lithology can be summarized in five mineral maps at km-scale. We found …
Cloud Atlas: Variability in and out of the Water Band in the Planetary-mass HD 203030B Points to Cloud Sedimentation in Low-gravity L Dwarfs
Schneider, Glenn; Metchev, Stanimir; Apai, Dániel +11 more
We use the Wide Field Camera 3 on the Hubble Space Telescope to spectrophotometrically monitor the young L7.5 companion HD 203030B. Our time series reveal photometric variability at 1.27 and 1.39 µm on timescales compatible with rotation. We find a rotation period of {7.5}-0.5+0.6 hr: comparable to those observed in oth…
Application of Clumpy Torus Model to Broadband X-Ray Spectra of Two Seyfert 1 Galaxies: IC 4329A and NGC 7469
Tanimoto, Atsushi; Ueda, Yoshihiro; Kawaguchi, Toshihiro +2 more
We apply a new X-ray clumpy torus model, XCLUMPY, in which the clump distribution is assumed to be the same as that in the infrared clumpy torus model (CLUMPY) by Nenkova et al., to the broadband X-ray spectra of type-1 active galactic nuclei (AGNs) for the first time. We analyze the archival data of IC 4329A and NGC 7469 observed with NuSTAR/Suza…
HALO7D I. The Line-of-sight Velocities of Distant Main-sequence Stars in the Milky Way Halo
Barro, Guillermo; Guhathakurta, Puragra; Kirby, Evan N. +5 more
The Halo Assembly in Lambda-CDM: Observations in 7 Dimensions (HALO7D) data set consists of Keck II/DEIMOS spectroscopy and Hubble Space Telescope-measured proper motions of Milky Way halo main-sequence turnoff stars in the CANDELS fields. In this paper, we present the spectroscopic component of this data set and discuss target selection, observin…
Statistical Survey of the Terrestrial Bow Shock Observed by the Cluster Spacecraft
Maksimovic, M.; Santolik, O.; Němec, F. +6 more
The terrestrial bow shock provides us with a unique opportunity to extensively investigate properties of collisionless shocks using in situ measurements under a wide range of upstream conditions. Here we report a statistical study of 529 terrestrial bow shock crossings observed between years 2001 and 2013 by the four Cluster spacecraft. By applyin…