Search Publications
A Hydrodynamic Study of the Escape of Metal Species and Excited Hydrogen from the Atmosphere of the Hot Jupiter WASP-121b
Lavvas, Panayotis; Koskinen, Tommi; Fossati, Luca +1 more
In the near-UV and optical transmission spectrum of the hot Jupiter WASP-121b, recent observations have detected strong absorption features of Mg, Fe, Ca, and Hα, extending outside of the planet's Roche lobe. Studying these atomic signatures can directly trace the escaping atmosphere and constrain the energy balance of the upper atmosphere. To und…
Catalogue of solar-like oscillators observed by TESS in 120-s and 20-s cadence
Li, Yaguang; Chaplin, William J.; Davies, Guy R. +12 more
Context. The Transiting Exoplanet Survey Satellite (TESS) mission has provided photometric light curves for stars across nearly the entire sky. This allows for the application of asteroseismology to a pool of potential solar-like oscillators that is unprecedented in size.
Aims: We aim to produce a catalogue of solar-like oscillators observed …
Type II radio bursts and their association with coronal mass ejections in solar cycles 23 and 24
Kilpua, E. K. J.; Kumari, A.; Morosan, D. E. +1 more
Context. Meter-wavelength type II solar radio bursts are thought to be the signatures of shock-accelerated electrons in the corona. Studying these bursts can give information about the initial kinematics, dynamics, and energetics of coronal mass ejections (CMEs) in the absence of white-light observations.
Aims: We investigate the occurrence o…
SN 2020qlb: A hydrogen-poor superluminous supernova with well-characterized light curve undulations
Sollerman, J.; Bloom, J. S.; Omand, C. M. B. +21 more
Context. SN 2020qlb (ZTF20abobpcb) is a hydrogen-poor superluminous supernova (SLSN-I) that is among the most luminous (maximum Mg = −22.25 mag) and that has one of the longest rise times (77 days from explosion to maximum). We estimate the total radiated energy to be > 2.1 × 1051 erg. SN 2020qlb has a well-sampled light c…
The Stellar Abundances and Galactic Evolution Survey (SAGES). I. General Description and the First Data Release (DR1)
Zhao, Gang; Fan, Zhou; Wang, Wei +35 more
The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable to those from low-resolution optical spectra. It was carried out with the 2.3 m Bok telescope of Steward Observatory and three other telescop…
JWST Measurements of 13C, 18O, and 17O in the Atmosphere of Super-Jupiter VHS 1256 b
Zhang, Yapeng; Gandhi, Siddharth; de Regt, Sam +4 more
Isotope ratios have recently been measured in the atmospheres of directly imaged and transiting exoplanets from ground-based observations. The arrival of JWST allows us to characterize exoplanetary atmospheres in further detail and opens up wavelengths inaccessible from the ground. In this work we constrain the carbon and oxygen isotopes 13
An extended [C II] halo around a massive star-forming galaxy at z = 5.3
Aravena, M.; Díaz-Santos, T.; Decarli, R. +8 more
High-redshift observations are often biased towards massive and bright galaxies that are not necessarily representative of the full population. In order to accurately study galaxy evolution and mass assembly at these redshifts, observations of 'normal' main sequence galaxies are required. Here we present Atacama Large Millimeter/Submillimeter Arra…
Weak-lensing Mass Bias in Merging Galaxy Clusters
Nagai, Daisuke; Jee, M. James; Finner, Kyle +6 more
Although weak lensing (WL) is a powerful method to estimate a galaxy cluster mass without any dynamical assumptions, a model bias can arise when the cluster density profile departs from the assumed model profile. In a merging system, the bias is expected to become most severe because the constituent halos undergo significant structural changes. In…
Long-term changes in solar activity and irradiance
Chatzistergos, Theodosios; Krivova, Natalie A.; Yeo, Kok Leng
The Sun is the main energy source to Earth, and understanding its variability is of direct relevance to climate studies. Measurements of total solar irradiance (TSI) exist since 1978, but this is too short compared to climate-relevant time scales. Coming from a number of different instruments, these measurements require a cross-calibration, which …
Confirmation of an Anomalously Low Dark Matter Content for the Galaxy NGC 1052-DF4 from Deep, High-resolution Continuum Spectroscopy
van Dokkum, Pieter; Shen, Zili; Danieli, Shany
NGC 1052-DF4 was found to be the second "galaxy lacking dark matter" in the NGC 1052 group, based on its velocity dispersion of ${\sigma }_{\mathrm{gc}}={4.2}_{-2.2}^{+4.4}$ km s-1 as measured from the radial velocities of seven of its globular clusters. Here we verify this result by measuring the stellar velocity dispersion of the gala…