Sangeetha Nandakumar
A5076896055- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Geology and Paleoclimatology Research
- BRCA gene mutations in cancer
- Video Analysis and Summarization
- Space Satellite Systems and Control
- Inertial Sensor and Navigation
- Video Coding and Compression Technologies
- Advanced Breast Cancer Therapies
- Planetary Science and Exploration
- Computer Graphics and Visualization Techniques
- Astrophysical Phenomena and Observations
- Medication Adherence and Compliance
- Radio Astronomy Observations and Technology
Mount Sinai Hospital
2024
University of Atacama
2019-2023
We report the discovery of TOI 837b and its validation as a transiting planet. characterize system using data from NASA TESS mission, ESA Gaia ground-based photometry El Sauce ASTEP400, spectroscopy CHIRON, FEROS, Veloce. find that 837 is $T=9.9$ mag G0/F9 dwarf in southern open cluster IC 2602. The star planet are therefore $35^{+11}_{-5}$ million years old. Combining transit with prior on stellar parameters derived color-magnitude diagram, we has an orbital period $8.3\,{\rm d}$ slightly...
We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m b 30.8 ± 1.5 M ⊕ , R 4.7 0.3 ) located in “hot Neptune desert”. Confirmation TESS Object Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well from photometric data TESS, Spitzer ground-based photometry MuSCAT2, TRAPPIST-South, MONET-South, George Mason University telescope, Las Cumbres Observatory Global Telescope network, El Sauce TÜBİTAK...
Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy1. Current orbiting constellation have brightnesses between apparent magnitudes 4 and 6, whereas the near-infrared Ks band, they can reach magnitude 2 (ref. 2). Satellite operators, astronomers other users night sky are working on brightness mitigation strategies3,4. Radio emissions induce further potential risk radio telescopes that also need be evaluated. Here we...
TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS Mission. These planets were found to be in or near 2:1 resonance, and both them exhibit transit timing variations (TTVs). Precise characterization planets' masses radii, orbital properties, resonant behavior can test theories for origins orbiting close their stars. Previous system using first six sectors data suffered from degeneracy between planet mass eccentricity. Radial velocity measurements HARPS, FEROS, PFS break...
TOI-2202 b is a transiting warm Jovian-mass planet with an orbital period of P=11.91 days identified from the Full Frame Images data five different sectors TESS mission. Ten transits combined three follow-up light curves obtained CHAT robotic telescope show strong transit timing variations (TTVs) amplitude about 1.2 hours. Radial velocity FEROS, HARPS and PFS confirms planetary nature candidate (a$_{\rm b}$ = 0.096 $\pm$ 0.002 au, m$_{\rm 0.98 0.06 M$_{\rm Jup}$), dynamical analysis RVs,...
Abstract We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 Transiting Exoplanet Survey Satellite ( TESS ) mission confirmed with radial velocities. b has mass <?CDATA ${\text{}}{M}_{{\text{}}p}$?> = ${1.236}_{-0.067}^{+0.069}$?> ${\text{}}{M}_{{\rm{J}}}$?> , radius ${\text{}}{R}_{{\text{}}P}$?> $1.170\pm 0.03$?> ${\text{}}{R}_{{\rm{J}}}$?> orbits its bright host star V 9.8 mag) an orbital period $11.23660\pm 0.00011$?> d,...
ABSTRACT HD 21749 is a bright (V = 8.1 mag) K dwarf at 16 pc known to host an inner terrestrial planet 21749c as well outer sub-Neptune 21749b, both delivered by Transiting Exoplanet Survey Satellite (TESS). Follow-up spectroscopic observations measured the mass of 21749b be 22.7 ± 2.2 M⊕ with density $7.0^{+1.6}_{-1.3}$ g cm−3, making it one densest sub-Neptunes. However, measurement was suspected influenced stellar rotation. Here, we present new high-cadence PFS RV data disentangle...
We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m_b 30.8 +/- 1.5 M_earth , R_b 4.7 0.3 R_earth ) located in 'hot Neptune desert'. Confirmation TESS Object Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well from photometric data TESS, Spitzer, ground-based photometry MuSCAT2, TRAPPIST- South, MONET-South, George Mason University telescope, Las Cumbres Observatory Global Telescope network, El...
TESS (Transiting Exoplanet Survey Satellite) was launched in 2018 with the purpose of observing bright stars solar neighbourhood to search for transiting exoplanets. After completion two year nominal mission, has provided 2\,minute cadence photometry over 200\,000 stars. This large collection light curves opens possibility study statistical and temporal properties this ensemble Most currently available data pipelines are designed work on single sector at a time. We present new pipeline...
Abstract Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy [1]. Currently orbiting constellation have visual brightnesses between apparent magnitudes 4 and 6, satellite operators, astronomers, other users the night sky are working on brightness mitigation strategies [2,3]. Here we report outcome an international optical observation campaign a prototype satellite, AST Space Mobile’s “BlueWalker 3”. BlueWalker 3...
TESS (Transiting Exoplanet Survey Satellite) was launched in 2018 with the purpose of observing bright stars solar neighbourhood to search for transiting exoplanets. After completion two year nominal mission, has provided 2\,minute cadence photometry over 200\,000 stars. This large collection light curves opens possibility study statistical and temporal properties this ensemble Most currently available data pipelines are designed work on single sector at a time. We present new pipeline...