Search Publications
Stellar Cores in the Sh 2-305 H II Region
Pandey, Rakesh; Sharma, Saurabh; Panwar, Neelam +6 more
Using our deep optical and near-infrared photometry along with multiwavelength archival data, we here present a detailed study of the Galactic H II region Sh 2-305 to understand the star/star-cluster formation. On the basis of excess infrared emission, we have identified 116 young stellar objects (YSOs) within a field of view of ∼18'5 × 18'5 aroun…
Flux Erosion of Magnetic Clouds by Reconnection With the Sun's Open Flux
Nandy, Dibyendu; Pal, Sanchita; Dash, Soumyaranjan
Magnetic clouds (MCs) are flux rope magnetic structures forming a subset of solar coronal mass ejections, which have significant space weather impacts. The geoeffectiveness of MCs depends on their properties, which evolve during their interplanetary passage. Based on an analysis of observations spanning two solar cycles, we establish that MCs inte…
Simultaneous Optical Transmission Spectroscopy of a Terrestrial, Habitable-zone Exoplanet with Two Ground-based Multiobject Spectrographs
Charbonneau, David; Kempton, Eliza M. -R.; Diamond-Lowe, Hannah +2 more
Investigating the atmospheres of rocky exoplanets is key to performing comparative planetology between these worlds and the terrestrial planets that reside in the inner solar system. Terrestrial exoplanet atmospheres exhibit weak signals, and attempting to detect them pushes at the boundaries of what is possible for current instrumentation. We foc…
Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars
Henry, Todd J.; van Belle, Gerard T.; Winters, Jennifer G. +13 more
We report 370 measures of 170 components of binary and multiple-star systems, obtained from speckle imaging observations made with the Differential Speckle Survey Instrument at Lowell Observatory's Discovery Channel Telescope in 2015 through 2017. Of the systems studied, 147 are binary stars, 10 are seen as triple systems, and 1 quadruple system i…
An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio Correlation for High-redshift Dusty Star-forming Galaxies
Smail, I.; Thomson, A. P.; Scott, D. +17 more
We study the radio properties of 706 submillimeter galaxies (SMGs) selected at 870 µm with the Atacama Large Millimeter Array from the SCUBA-2 Cosmology Legacy Survey map of the Ultra Deep Survey field. We detect 273 SMGs at >4σ in deep Karl G. Jansky Very Large Array 1.4 GHz observations, of which a subset of 45 SMGs are additionally det…
Application of Synoptic Magnetograms to Global Solar Activity Forecast
Kitiashvili, I. N.
Synoptic magnetograms provide us with knowledge about the evolution of magnetic fields on the solar surface and present important information for forecasting future solar activity. In this work, poloidal and toroidal magnetic field components derived from synoptic magnetograms are assimilated, using the Ensemble Kalman Filter method, into a mean-f…
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<…