Dennis M. Conti
A5067425639- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Astronomical and nuclear sciences
- Isotope Analysis in Ecology
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Retinal Development and Disorders
- Solar and Space Plasma Dynamics
- Economic and Technological Innovation
- Visual perception and processing mechanisms
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Photocathodes and Microchannel Plates
- Spatial Cognition and Navigation
- Space Exploration and Technology
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
American Association of Variable Star Observers
2018-2025
Tufts University
2004
Abstract We present the discovery and characterization of TOI-4364b, a young mini-Neptune in tidal tails Hyades cluster, identified through TESS transit observations ground-based follow-up photometry. The planet orbits bright M dwarf ( K = 9.1 mag) at distance 44 pc, with an orbital period 5.42 days equilibrium temperature <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>48</mml:mn> <mml:msubsup> <mml:mrow> <mml:mn>8</mml:mn> </mml:mrow> <mml:mo>−</mml:mo>...
We present TRICERATOPS, a new Bayesian tool that can be used to vet and validate TESS Objects of Interest (TOIs). test the on 68 TOIs have been previously confirmed as planets or rejected astrophysical false positives. By looking in positive probability (FPP) -- nearby (NFPP) plane, we define criteria must meet classified validated (FPP < 0.015 NFPP 10^-3), likely 0.5 positives (NFPP > 10^-1). apply this procedure 384 unclassified statistically 12, classify 125 planets, 52 Of 12 9 are newly...
Abstract We present the discovery and validation of a three-planet system orbiting nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). lies in TESS continuous viewing zone Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R ⊕ to 2.6 orbital periods 9.98 37.43 days. Ground-based follow-up combined diagnostic vetting tests enables us rule out common astrophysical false-positive scenarios validate planets. The outermost planet, d,...
We present the confirmation of two new planets transiting nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, $V=13.07$, $K_s=8.204$, $R_s$=0.374 R$_{\odot}$, $M_s$=0.401 M$_{\odot}$, d=22 pc). The planet candidates are identified in a single TESS sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, high-resolution imaging. With measured orbital periods $P_b=0.77$ days, $P_c=12.25$ days sizes $r_{p,b}=1.33\pm 0.07$ R$_{\oplus}$, $r_{p,c}=2.30\pm 0.16$...
Abstract NASA’s Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample transiting suitable for population studies. Assembling such a requires confirming hundreds planet candidates with additional follow-up observations. Here we present 20 that were detected using TESS data and confirmed be planets through photometric, spectroscopic, imaging observations coordinated the Follow-up Observing...
Abstract JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates still unconfirmed and many the best planets for atmospheric characterization may remain be identified. We present a sample TESS that we identify as “best-in-class” transmission emission spectroscopy with JWST. These targets sorted into bins across equilibrium...
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at distance 10.6 pc. Using Gaia-measured and broad-band photometry we find that host star is an M3 dwarf. Combined with TESS transits from sectors, corresponding stellar parameters yield planet radii ranging 0.8REarth to 1.6REarth. All have short orbital periods, 2.25 7.45 days outer pair just wide 2:1 period resonance....
Abstract Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present discovery young system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). is a member 120 Myr old Pisces–Eridanus stream (Psc–Eri). confirm membership in with its kinematics, lithium abundance, rotation UV excesses both wide-binary companion, B (itself likely an M-dwarf binary). identified three candidate planets transiting Transiting Exoplanet Survey...
We report the first discovery of a transiting circumbinary planet detected from single sector TESS data. During Sector 21, TIC 172900988b transited primary star and then 5 days later it secondary star. The binary is itself eclipsing, with period P = 19.7 an eccentricity e 0.45. Archival data ASAS-SN, Evryscope, KELT, SuperWASP reveal prominent apsidal motion orbit, caused by dynamical interactions between planet. A comprehensive photodynamical analysis TESS, archival follow-up yields stellar...
Abstract LTT 1445 is a hierarchical triple M-dwarf star system located at distance of 6.86 pc. The primary 1445A (0.257 M ⊙ ) known to host the transiting planet 1445Ab with an orbital period 5.36 days, making it second-closest exoplanet system, and closest one for which dwarf. Using Transiting Exoplanet Survey Satellite data, we present discovery second in 3.12 days. We combine radial-velocity measurements obtained from five spectrographs, Echelle Spectrograph Rocky Exoplanets Stable...
We report the Transiting Exoplanet Survey Satellite ($TESS$) detection of a multi-planet system orbiting $V=10.9$ K0 dwarf TOI 125. find evidence for up to five planets, with varying confidence. Three high signal-to-noise transit signals correspond sub-Neptune-sized planets ($2.76$, $2.79$, and $2.94\ R_{\oplus}$), we statistically validate planetary nature two inner ($P_b = 4.65$ days, $P_c 9.15$ days). With only transits observed, outer object ($P_{.03} 19.98$ days) as ratio planet...
Due to the efforts by numerous ground-based surveys and NASA's Kepler Transiting Exoplanet Survey Satellite (TESS), there will be hundreds, if not thousands, of transiting exoplanets ideal for atmospheric characterization via spectroscopy with large platforms such as James Webb Space Telescope ARIEL. However their next predicted mid-transit time could become so increasingly uncertain over that significant overhead would required ensure detection entire transit. As a result, follow-up...
Abstract The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these heavily depends on ground-based radial velocity (RV) surveys, which combined with transit photometry can yield bulk densities orbital properties. While most host stars too faint for detailed follow-up observations, is detecting orbiting nearby bright more amenable to RV characterization. Here, we introduce TESS-Keck Survey (TKS), an program using ∼100 nights Keck/HIRES study...
Abstract Astronomers do not have a complete picture of the effects wide-binary companions (semimajor axes greater than 100 au) on formation and evolution exoplanets. We investigate these using new data from Gaia Early Data Release 3 Transiting Exoplanet Survey Satellite mission to characterize systems with transiting identify sample 67 exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. derive limits parameters for measure...
ABSTRACT We present the discovery and characterization of six short-period, transiting giant planets from NASA’s Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 394050135), TOI-2145 88992642), TOI-2152 395393265), TOI-2154 428787891), TOI-2497 97568467). All orbit bright host stars (8.9 &lt;G &lt; 11.8, 7.7 &lt;K 10.1). Using a combination time-series photometric spectroscopic follow-up observations TESS Follow-up Observing Program Working...
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and 38. is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with mass $0.68\pm0.05$ M$_{\odot}$ radius $0.67\pm0.01$ R$_{\odot}$. obtain photometric follow-up observations variety facilities, we use these data-sets to determine that inner planet, b, $1.70\pm0.07$ R$_{\oplus}$ super-Earth in 3.82 day orbit,...
The TOI-1130 is a known planetary system around K-dwarf consisting of gas giant planet, c, on an 8.4-day orbit, accompanied by inner Neptune-sized b, with orbital period 4.1 days. We collected precise radial velocity (RV) measurements the HARPS and PFS spectrographs as part our ongoing RV follow-up program. perform photodynamical modeling RVs, transit photometry from Transiting Exoplanet Survey Satellite (TESS) TESS Follow-up Observing Program. determine planet masses radii b c to be Mb =...
Abstract AU Mic is a young (22 Myr), nearby exoplanetary system that exhibits excess transit timing variations (TTVs) cannot be accounted for by the two known transiting planets nor stellar activity. We present statistical “validation” of tentative planet d (even though there are examples “confirmed” with ambiguous orbital periods). add 18 new transits and nine midpoint times in an updated TTV analysis to prior work. perform joint modeling light curves using EXOFASTv2 extract times. Next, we...
Abstract The effect of stellar multiplicity on planetary architecture and orbital dynamics provides an important context for exoplanet demographics. We present a volume-limited catalog up to 300 pc 66 stars hosting planets planet candidates from Kepler, K2, TESS with significant Hipparcos-Gaia proper motion anomalies, which indicates the presence companions. assess reliability each transiting candidate using ground-based follow-up observations, find that Objects Interest (TOIs) anomalies...
Abstract Sub-Neptunes—volatile-rich exoplanets smaller than Neptune—are intrinsically the most common type of planet known. However, formation and nature these objects, as well distinctions between subclasses (if any), remain unclear. Two powerful tools to tease out secrets worlds are measurements (i) atmospheric composition structure revealed by transit and/or eclipse spectroscopy, (ii) mass, radius, density photometry Doppler spectroscopy. Here, we present OrCAS, a survey better elucidate...
Abstract NCORES was a large observing program on the ESO HARPS spectrograph, dedicated to measuring masses of Neptune-like and smaller transiting planets discovered by TESS satellite using radial velocity technique. This paper presents an overview programme, its scientific goals published results, covering 35 in 18 planetary systems. We present spectrally derived stellar characterisation mass constraints for five additional TOIs where observations found only marginally significant signals...
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...
Atmospheric temperature and planetary gravity are thought to be the main parameters affecting cloud formation in giant exoplanet atmospheres. Recent attempts understand have explored wide regions of equilibrium temperature-gravity parameter space. In this study, we instead compare case two planets with nearly identical ($T_\mathrm{eq}$ $\sim 1050 \, \mathrm{K}$) ($g \sim 10 \mathrm{m s}^{-1})$. During $HST$ Cycle 23, collected WFC3/G141 observations planets, WASP-67 b HAT-P-38 b. b, mass...
Abstract We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 ( SCR J1448-5735 ), nearby d = 64 pc) K4V star, using data from Transiting Exoplanet Survey Satellite. The newly discovered planet has radius R p 2.93 ± 0.20 <?CDATA ${R}_{\oplus }$?> and an orbital period 1.393 days. Radial velocity measurements Planet Finder Spectrograph High Accuracy Searcher spectrograph confirm existence planet, we estimate its mass to be 18.47 1.84 ${M}_{\oplus . planet’s mean...