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HST Grism-derived Forecasts for Future Galaxy Redshift Surveys
Bagley, Micaela B.; Scarlata, Claudia; Mehta, Vihang +8 more
The mutually complementary Euclid and Roman galaxy redshift surveys will use Hα- and [O III]-selected emission-line galaxies (ELGs) as tracers of the large-scale structure at 0.9 ≲ z ≲ 1.9 (Hα) and 1.5 ≲ z ≲ 2.7 ([O III]). It is essential to have a reliable and sufficiently precise knowledge of the expected numbers of Hα-emitting galaxies in the s…
An orbital water-ice cycle on comet 67P from colour changes
Longobardo, Andrea; Mottola, Stefano; Arnold, Gabriele +10 more
Solar heating of a cometary surface provides the energy necessary to sustain gaseous activity, through which dust is removed1,2. In this dynamical environment, both the coma3,4 and the nucleus5,6 evolve during the orbit, changing their physical and compositional properties. The environment around an active nucleus …
Ground-based transmission spectroscopy with FORS2: A featureless optical transmission spectrum and detection of H2O for the ultra-hot Jupiter WASP-103b
Madhusudhan, Nikku; Nikolov, Nikolay; Constantinou, Savvas +11 more
We report ground-based transmission spectroscopy of the highly irradiated and ultra-short period hot-Jupiter WASP-103b covering the wavelength range ≈400-600 nm using the FORS2 instrument on the Very Large Telescope. The light curves show significant time-correlated noise which is mainly invariant in wavelength and which we model using a Gaussian …
The Forgotten Quadrant Survey. 12CO and 13CO (1-0) survey of the Galactic plane in the range 220° <l <240° -2.°5 < b < 0°
Rygl, K. L. J.; Testi, L.; Benedettini, M. +12 more
Aims: We present the Forgotten Quadrant Survey (FQS), an ESO large project that used the 12 m antenna of the Arizona Radio Observatory to map the Galactic plane in the range 220° < l < 240° and -2.°5 < b < 0°, both in 12CO (1-0) and 13CO (1-0), at a spectral resolution of 0.65 km s-1 and 0.26 km s<…
Spectroscopically Identified Cataclysmic Variables from the LAMOST Survey. I. The Sample
Qin, Li; Hou, Wen; Li, Yin-Bi +1 more
A sample of cataclysmic variables (CVs) is presented including spectroscopically identified 380 spectra of 245 objects, of which 58 CV candidates are new discoveries. The BaggingTopPush and the Random Forest algorithms are applied to the Fifth Data Release (DR5) of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) to retrieve …
Revised astrometric calibration of the Gemini Planet Imager
Duchêne, Gaspard; Esposito, Thomas M.; Oppenheimer, Rebecca +49 more
We present a revision to the astrometric calibration of the Gemini Planet Imager (GPI), an instrument designed to achieve the high contrast at small angular separations necessary to image substellar and planetary-mass companions around nearby, young stars. We identified several issues with the GPI data reduction pipeline (DRP) that significantly a…
On a century of extragalactic novae and the rise of the rapid recurrent novae
Darnley, Matthew J.; Henze, Martin
Novae are the observable outcome of a transient thermonuclear runaway on the surface of an accreting white dwarf in a close binary system. Their high peak luminosity renders them visible in galaxies out beyond the distance of the Virgo Cluster. Over the past century, surveys of extragalactic novae, particularly within the nearby Andromeda Galaxy, …
Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems
Li, Zhengxiang; Zhou, Huan
Model-independent measurements for the cosmic spatial curvature, which is related to the nature of cosmic spacetime geometry, play an important role in cosmology. On the basis of the distance sum rule in the Friedmann-Lemaître-Robertson-Walker metric, (distance ratio) measurements of strong gravitational lensing (SGL) systems, together with distan…
Monitoring the Spatio-temporal Evolution of a Reconnection X-line in Space
Vaivads, A.; Wang, Z.; Cao, J. B. +3 more
Inherently, magnetic reconnection—the process responsible for stellar flares and magnetospheric substorms—is very dynamic in space, owing to magnetic fluctuations and unsteady inflows. However, this process was always explained as a static picture in spacecraft measurements, neglecting the temporal evolution. This picture is not correct. Here we p…
Discovery of a mid-infrared protostellar outburst of exceptional amplitude
Minniti, D.; Stecklum, B.; Saito, R. K. +12 more
We report the discovery of a mid-infrared outburst in a young stellar object (YSO) with an amplitude close to 8 mag at λ ≈ 4.6 µm. WISEA J142238.82-611553.7 is one of 23 highly variable Wide-field Infrared Survey Explorer (WISE) sources discovered in a search of infrared dark clouds (IRDCs). It lies within the small IRDC G313.671-0.309 (d ≈2…