Search Publications
Searching for debris discs in the 30 Myr open cluster IC 4665
Miret-Roig, N.; Huélamo, N.; Bouy, H.
Context. Debris discs orbiting young stars are key to understanding dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe surveys to revisit the disc population of this cluster.
Aims: We aim to study the disc population of IC …
The stellar rotation-activity relation for a sample of SuperWASP and ASAS-SN field stars
Thiemann, Heidi B.; Norton, Andrew J.; Kolb, Ulrich C.
It is well established that late-type main-sequence (MS) stars display a relationship between X-ray activity and the Rossby number, Ro, the ratio of rotation period to the convective turnover time. This manifests itself as a saturated regime (where X-ray activity is constant) and an unsaturated regime (where X-ray activity anti-correlates with Ros…
Periodic brightening of Kepler light curves: investigating the possibility of forward scattering due to dust clouds
Kenworthy, M.; van Kooten, M. A. M.; Doelman, N.
Dedicated transiting surveys, such as the Kepler space telescope, have provided the astronomy community with a rich data set resulting in many new discoveries. In this paper, we look at eight Kepler objects identified by Wheeler & Kipping with a periodic, broad increase in flux, that look distinctly different from intrinsic star variability. W…
Spectral Modeling of Charge Exchange in the Central Region of M51
Zhang, Shuinai; Ji, Li; Yang, Hang
Charge exchange (CX) emission reveals the significant interaction between neutral and ionized interstellar medium components of the dense, multiphase, circumnuclear region of a galaxy. We use a model including a thermal and CX components to describe the high-resolution XMM-Newton/RGS spectrum of the diffuse emission in the central region of M51. R…
Submillimeter and Far-infrared Spectroscopy of Monodeuterated Amidogen Radical (NHD): Improved Rest Frequencies for Astrophysical Observations
Bizzocchi, Luca; Melosso, Mattia; Giuliano, Barbara Michela +6 more
Observations of ammonia in interstellar environments have revealed high levels of deuteration, and all its D-containing variants, including ND3, have been detected in cold prestellar cores and around young protostars. The observation of these deuterated isotopologues is very useful for elucidating the chemical and physical processes tak…
Sparse subsurface radar reflectors in Hellas Planitia, Mars
Goudge, Timothy A.; Byrne, Shane; Viola, Donna +5 more
Geomorphological features potentially related to subsurface ice, such as scalloped depressions, expanded craters, pedestal craters, and banded terrain, are present in and around Hellas Planitia, Mars. We present a radar survey of the region using the Shallow Radar (SHARAD) instrument on board the Mars Reconnaissance Orbiter (MRO) to identify candi…
General relativistic impact on the precision of BepiColombo gravity-assists
Yefremov, Alexander P.
The general relativistic (GR) impact is assessed on the precision of the announced BepiColombo (BC) space positions at the Earth, Venus and Mercury flyby points providing planned gravity-assists. Apart of the known elliptic orbit precession, another recently specified for the Schwarzschild-Kerr metric effect of the ellipse axes contraction is cons…
The KMOS Lens-Amplified Spectroscopic Survey (KLASS): kinematics and clumpiness of low-mass galaxies at cosmic noon
Schaerer, D.; Vulcani, B.; Treu, T. +9 more
We present results from the KMOS Lens-Amplified Spectroscopic Survey (KLASS), an ESO Very Large Telescope (VLT) large program using gravitational lensing to study the spatially resolved kinematics of 44 star-forming galaxies at 0.6 < z < 2.3 with a stellar mass of 8.1 < log(M⋆/M⊙) < 11.0. These galaxies are locate…
Serial Flaring in an Active Region: Exploring Why Only One Flare Is Eruptive
Harra, Louise K.; Matthews, Sarah A.; Kusano, Kanya +2 more
Over a four hour period between 2014 June 12-13 a series of three flares were observed within AR 12087. This sequence of flares started with a non-eruptive M-class flare, followed by a non-eruptive C-class flare, and finally ended with a second C-class flare that had an associated filament eruption. In this paper we combine spectroscopic analysis …
High-z Universe Probed via Lensing by QSOs (HULQ). I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
Im, Myungshin; Taak, Yoon Chan
It is unclear how galaxies and their central supermassive black holes coevolve across cosmic time, especially for the nonlocal universe (z ≳ 0.5). The High-z Universe probed via Lensing by QSOs project proposes to utilize quasi-stellar object (QSO) host galaxies acting as gravitational lenses (QSO lenses) to investigate this topic. This paper focu…