A5068176750- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Space Science and Extraterrestrial Life
- Spaceflight effects on biology
- Astronomical and nuclear sciences
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Economic and Technological Innovation
Massachusetts Institute of Technology
2020-2024
Vassar College
2021
Abstract The Sun is depleted in refractory elements compared to nearby solar twins, which may be linked the formation of giant or terrestrial planets. Here we present high-resolution, high signal-to-noise spectroscopic data for 17 solar-like stars hosting planets, obtained with Magellan II/MIKE, investigate whether this depletion related planet formation. We derive stellar parameters, including atmosphere, age, radius, mass, and chemical abundances 22 from carbon europium through...
We present the discovery of deep but sporadic transits in flux SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 years photometry from multiple sky surveys reveal evidence occasional dimming dwarf, most notably evident an 8-months-long event 2023 that caused >40% drop star. In-transit follow-up shows additional short-timescale (minutes- to hours-long) events. TESS suggests coherent 14.842-hr signal could represent dominant orbital period Six...
Abstract We present the discovery of deep but sporadic transits in flux SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 yr photometry from multiple sky surveys reveal evidence occasional dimming dwarf, most notably evident an 8 month long event 2023 that caused >40% drop star. In-transit follow-up shows additional short-timescale (minutes- to hours-long) events. Transiting Exoplanet Survey Satellite suggests coherent 14.842 hr signal could...
HD 191939 (TOI-1339) is a nearby (d=54pc), bright (V=9mag), and inactive Sun-like star (G9 V) known to host multi-planet transiting system. Ground-based spectroscopic observations confirmed the planetary nature of three sub-Neptunes (HD b, c, d) originally detected by TESS were used measure masses for planets b c with 3$\sigma$ precision. These previous also reported discovery an additional Saturn-mass planet e) evidence further, very long-period companion f). Here, we report new...
ABSTRACT Over the past several decades, conventional spectral analysis techniques of polluted white dwarfs have become powerful tools to learn about geology and chemistry extrasolar bodies. Despite their proven capabilities extensive legacy scientific discoveries, these are, however, still limited by manual, time-intensive, iterative nature. As a result, they are susceptible human errors difficult scale up population-wide studies metal pollution. This paper seeks address this problem...
Abstract We present the discovery of three sub-Neptune-sized planets transiting nearby and bright Sun-like star HD 191939 (TIC 269701147, TOI 1339), a K s = 7.18 mag G8 V dwarf at distance only 54 pc. validate planetary nature transit signals by combining 5 months data from Transiting Exoplanet Survey Satellite with follow-up ground-based photometry, archival optical images, radial velocities, high angular resolution observations. The sub-Neptunes have similar radii ( <?CDATA...
We report the discovery and validation of four extrasolar planets hosted by nearby, bright, Sun-like (G3V) star HD~108236 using data from Transiting Exoplanet Survey Satellite (TESS). present transit photometry, reconnaissance precise Doppler spectroscopy as well high-resolution imaging, to validate planetary nature objects transiting HD~108236, also known TESS Object Interest (TOI) 1233. The innermost planet is a possibly-rocky super-Earth with period $3.79523_{-0.00044}^{+0.00047}$ days...
ABSTRACT We present a catalogue of 62 polluted white dwarfs observed by the 9th Low-Resolution Data Release Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST LRS DR9v1; R≈1800) and Early 3 (EDR3) Gaia Mission. Among these stellar remnants, 30 are new discoveries with previously unknown traces calcium pollution. To generate our catalogue, we used data base 4324 unique EDR3 dwarf candidates LAMOST DR9v1 observations, many which have been spectroscopically confirmed other...
Abstract HD 219134 is a K3V dwarf star with six reported radial-velocity discovered planets. The two innermost planets b and c show transits, raising the possibility of this system to be nearest (6.53 pc), brightest ( V = 5.57) example compact multiple transiting planet system. Ground-based searches for transits beyond are not feasible because infrequent long transit duration (∼5 hr), shallow depths (<1%), large time uncertainty (∼half day). We use space-based telescopes Arcsecond Space...
ABSTRACT Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion exoplanetary material. While wide range mechanisms been proposed to account this there are currently few observational constraints differentiate between them. To investigate the driving mechanism, we observe sample polluted and non-polluted in binary systems with main-sequence stars. Using companion stars’ metallicities as proxy dwarfs’ primordial metallicities, compare systems....
Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion exoplanetary material. While wide range mechanisms been proposed to account this there are currently few observational constraints differentiate between them. To investigate the driving mechanism, we observe sample polluted and non-polluted in binary systems with main-sequence stars. Using companion stars' metallicities as proxy dwarfs' primordial metallicities, compare systems. Because...
The Sun is depleted in refractory elements compared to nearby solar twins, which may be linked the formation of giant or terrestrial planets. Here we present high-resolution, high signal-to-noise spectroscopic data for 17 solar-like stars hosting planets, obtained with Magellan II/MIKE, investigate whether this depletion related planet formation. We derive stellar parameters, including atmosphere, age, radius, mass, and chemical abundances 22 from carbon europium through line-by-line...
We present a catalogue of 62 polluted white dwarfs observed by the 9th Low-Resolution Data Release Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST LRS DR9v1; R$\approx$1,800) and Early 3 (EDR3) Gaia Mission. Among these stellar remnants, 30 are new discoveries with previously unknown traces calcium pollution. To generate our catalogue, we used database 4,324 unique EDR3 dwarf candidates LAMOST DR9v1 observations, many which have been spectroscopically confirmed other...