A5073142020- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
Wellesley College
2022-2024
We report that the neutral hydrogen (HI) mass density of Universe ($\rho_{HI}$) increases with cosmic time since $z \sim 5$, peaks at 3$, and then decreases toward 0$. This is first result Qz5, our spectroscopic survey 63 quasars \gtrsim 5$ VLT/X-SHOOTER Keck/ESI aimed characterizing intervening HI gas absorbers 5$. The main feature Qz5 high resolution ($R 7000 - 9000$) spectra, which allows us to (1) accurately detect column in an increasingly intergalactic medium (2) determine reliability...
Abstract We report that the neutral hydrogen (H i ) mass density of Universe ( ρ H increases with cosmic time since z ∼ 5, peaks at 3, and then decreases toward 0. This is first result Qz5, our spectroscopic survey 63 quasars ≳ 5 VLT/X-SHOOTER Keck/ESI aimed characterizing intervening gas absorbers 5. The main feature Qz5 high resolution R 7000–9000) spectra, which allows us to (1) accurately detect column in an increasingly intergalactic medium (2) determine reliability previous...
Abstract Comet 67P/Churyumov‐Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology, where the southern hemisphere exhibits more erosional features than northern due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from through sublimation and significant fraction eventually descends as airfall, covering terrains. To investigate this south‐to‐north material transfer during comet's perihelion passage, we used...
Abstract Close-in gas giants present a surprising range of stellar obliquity, the angle between planet’s orbital axis and its host star’s spin axis. It is unclear whether obliquities reflect planets’ dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned high-eccentricity tidal migration) other mechanisms primordial misalignment planet–star interactions) are more important sculpting obliquity distribution. Here we measurement TOI-1268 (TIC-142394656, V mag...