A5078083472- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- History and Developments in Astronomy
- Space Exploration and Technology
- Semiconductor Lasers and Optical Devices
- Ionosphere and magnetosphere dynamics
- Pulsars and Gravitational Waves Research
- Superconducting Materials and Applications
- Spacecraft and Cryogenic Technologies
- Atomic and Molecular Physics
- Geophysics and Gravity Measurements
- Advanced Frequency and Time Standards
- Advanced optical system design
Pennsylvania State University
2014-2024
NASA Exoplanet Science Institute
2015-2021
NASA Astrobiology Institute
2020
Macquarie University
2018
Ludwig-Maximilians-Universität München
2014
Stuttgart Observatory
2014
Goddard Space Flight Center
2009
Kitt Peak National Observatory
1973-1999
Association of Universities For Research In Astronomy
1999
U.S. National Science Foundation
1999
view Abstract Citations (491) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of Possible p-Mode Oscillations on Procyon Brown, Timothy M. ; Gilliland, Ronald L. Noyes, Robert W. Ramsey, Lawrence In the course a search for solar-like oscillations in bright late-type stars, Doppler variability was observed F5 subgiant Procyon. The variations have frequencies within 1.1 mHz range centered at 0.9 mHz, and total rms amplitude that 2.5...
Abstract The Hobby–Eberly Telescope (HET) Dark Energy Experiment (HETDEX) is undertaking a blind wide-field low-resolution spectroscopic survey of 540 deg 2 sky to identify and derive redshifts for million Ly α -emitting galaxies in the redshift range 1.9 < z 3.5. ultimate goal measure expansion rate universe at this epoch, sharply constrain cosmological parameters thus nature dark energy. A major multiyear Wide-Field Upgrade (WFU) HET was completed 2016 that substantially increased field...
The Hobby-Eberly telescope (HET) is a recently completed 9- meter designed to specialize in spectroscopy. It saw first light December 1996 and during July 1997, it underwent its end-to-end testing acquiring spectra of target objects. We review the basic design HET. In addition we summarize performance used with commissioning spherical aberration correlator spectrograph, status science operations plans for implementation final corrector facility class instruments.
We present results from a 221.9 ks Chandra exposure of the HDF-N and its vicinity, concentrating on 8.6' X 8.7' area covered by Caltech Faint Field Galaxy Redshift Survey (the `Caltech area'). The minimum detectable fluxes in 0.5-2 keV 2-8 bands are 1.3e-16 cgs 6.5e-16 cgs, respectively total 82 sources detected. More than 80% extragalactic X-ray background band is resolved. Redshifts available for 96% with R<23; redshift range 0.1-3.5 most having z < 1.5. Eight located itself, including two...
We present spectroscopic rotation velocities (v sin i) for 56 M dwarf stars using high resolution HET HRS red spectroscopy. In addition we have also determined photometric effective temperatures, masses and metallicities ([Fe/H]) some observed here in the literature where could acquire accurate parallax measurements relevant photometry. increased number of known v is mid by around 80% can confirm a weakly increasing velocity with decreasing temperature. Our sample peak at low (~3 km/s). find...
We describe and characterize a 25 GHz laser frequency comb based on cavity-filtered erbium fiber mode-locked laser. The provides uniform array of optical frequencies spanning 1450 nm to 1700 nm, is stabilized by use global positioning system referenced atomic clock. This was deployed at the 9.2 m Hobby-Eberly telescope McDonald Observatory where it used as radial velocity calibration source for fiber-fed Pathfinder near-infrared spectrograph. Stellar targets were observed in three echelle...
The Habitable-Zone Planet Finder is a stabilized, fiber-fed, NIR spectrograph being built for the 10m Hobby- Eberly telescope (HET) that will be capable of discovering low mass planets around M dwarfs. optical design HPF white pupil layout in vacuum cryostat cooled to 180 K. uses gold-coated mirrors, mosaic echelle grating, and single Teledyne Hawaii-2RG (H2RG) detector with 1.7-micron cutoff covering parts information rich z, Y J bands at spectral resolution R∼50,000. unique HET requires...
We have developed an optical design for a high resolution spectrograph in response to NASA's call extreme precision Doppler spectrometer (EPDS) the WIYN telescope. Our instrument covers wavelength range of 380 930 nm using single detector and with 100,000. To deliver most stable spectrum, we avoid use image slicer, favor large (195 mm diameter) beam footprint on 1x2 mosaic R4 Echelle grating. The is based classic white pupil layout, parabolic mirror that used as main transfer collimator....
We present an empirical near-infrared (NIR) spectroscopic method for estimating M dwarf metallicities, based on features in the H band, as well implementation of a similar published K band. obtained R ∼ 2000 NIR spectra sample dwarfs using NASA IRTF-SpeX spectrograph, including 22 metallicity calibration targets that have FGK companions with known metallicities. The H-band and K-band calibrations provide equivalent fits to metallicities these binaries, accuracy ±0.12 dex. derive first...
Insufficient instrument thermo-mechanical stability is one of the many roadblocks for achieving 10cm/s Doppler radial velocity (RV) precision, precision needed to detect Earth-twins orbiting Solar-type stars. Highly temperature and pressure stabilized spectrographs allow us better calibrate out instrumental drifts, thereby helping in distinguishing noise from astrophysical stellar signals. We present design performance Environmental Control System (ECS) Habitable-zone Planet Finder (HPF), a...
Abstract The warm Neptune GJ 3470b transits a nearby ( d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two with the newly commissioned NEID spectrometer on WIYN 3.5 m Telescope at Kitt Peak Observatory, we model classical Rossiter–McLaughlin effect, yielding sky-projected obliquity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>λ</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>98</mml:mn>...
Abstract We present the discovery of TOI-5205b, a transiting Jovian planet orbiting solar metallicity M4V star, which was discovered using Transiting Exoplanet Survey Satellite photometry and then confirmed combination precise radial velocities, ground-based photometry, spectra, speckle imaging. TOI-5205b has one highest mass ratios for M-dwarf planets, with ratio almost 0.3%, as it orbits host star that is just 0.392 ± 0.015 M ⊙ . Its planetary radius 1.03 0.03 R J , while 1.08 0.06...
We report the discovery of a substellar-mass companion to K0 giant HD 17092 with Hobby-Eberly Telescope. In absence any correlation observed 360 day periodicity standard indicators stellar activity, radial velocity variations are most plausibly explained in terms Keplerian motion planetary-mass body around star. As estimated mass is 2.3 M☉, minimum planet 4.6 MJ. The planet's orbit characterized by mild eccentricity e = 0.17 and semimajor axis 1.3 AU. This tenth published detection planetary...
view Abstract Citations (231) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS NGC 7714 - The prototype star-burst galactic nucleus Weedman, D. W. ; Feldman, F. R. Balzano, V. A. Ramsey, L. Sramek, Wuu, C. -C. New X-ray, ultraviolet (IUE), optical, and radio (VLA) observations are presented for the bright galaxy 7714. All data explainable as resulting from intense star-formation activity in this a star burst. X-ray luminosities explained by...
We present the scientific motivation and conceptual design for recently funded Habitable-zone Planet Finder (HPF), a stabilized fiber-fed near-infrared (NIR) spectrograph 10 meter class Hobby-Eberly Telescope (HET) that will be capable of discovering low mass planets around M dwarfs. The HPF cover NIR Y & J bands to enable precise radial velocities obtained on mid dwarfs, detection these stars. is comprised cryostat cooled 200K, dual fiber-feed with science calibration fiber, gold coated...
We provide new measurements of wavenumbers and line identifications 10 100 UI UII near-infrared (NIR) emission lines between 2500 cm -1 12 000 (4000 nm to 850 nm) using archival FTS spectra from the National Solar Observatory (NSO).This list includes isolated uranium in Y, J, H, K, L bands (0.9 µm 1.1 µm, 1.2 1.35 1.5 1.65 2.0 2.4 3.0 4.0 respectively), provides six times as many calibration thorium NIR spectral range.The lists we enable inexpensive, commercially-available hollow-cathode...
Using solar spectral irradiance measurements from the SORCE spacecraft and F/F' technique, we have estimated radial velocity (RV) scatter induced on Sun by stellar activity as a function of wavelength. Our goal was to evaluate potential advantages using new near-infrared (NIR) spectrographs search for low-mass planets around bright F, G, K stars beating down effects. Unlike M dwarfs, which higher fluxes therefore greater RV information content in NIR, solar-type are brightest at visible...
We have used high-resolution spectroscopy to observe the Kepler-16 eclipsing binary as a double-lined system, and measure precise radial velocities for both stellar components. These yield dynamical mass-ratio of q=0.2994+-0.0031. When combined with inclination, i=90.3401+0.0016-0.0019 deg, measured from Kepler photometric data by Doyle et al. 2011, we derive masses components M_A=0.654+-0.017 M_sun M_B=0.1959+-0.0031 M_sun, precision 2.5% 1.5% respectively. Our results confirm at ~2% level...
We validate the discovery of a 2 Earth radii sub-Neptune-size planet around nearby high proper motion M2.5-dwarf G 9-40 (EPIC 212048748), using high-precision near-infrared (NIR) radial velocity (RV) observations with Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry custom narrow-band photometric filter, and adaptive optics imaging. At distance $d=27.9\mathrm{pc}$, 9-40b is second closest transiting discovered by K2 to date. The planet's large transit...
We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs. TOI-3714 ($V=15.24,~J=11.74$) is an M2 dwarf hosting a hot Jupiter ($M_p=0.70 \pm 0.03~\mathrm{M_J}$ and $R_p=1.01 0.03~\mathrm{R_J}$) on orbital period $2.154849 0.000001$ days with resolved white companion. TOI-3629 ($V=14.63,~J=11.42$) M1 ($M_p=0.26 0.02~\mathrm{M_J}$ $R_p=0.74 0.02~\mathrm{R_J}$) $3.936551_{-0.000006}^{+0.000005}$ days. characterize each transiting companion using combination...
We report the detection of first extrasolar planet, ET-1 (HD 102195b), using Exoplanet Tracker (ET), a new-generation Doppler instrument. The planet orbits HD 102195, young star with solar metallicity that may be part local association. imparts radial velocity variability to semiamplitude 63.4 ± 2.0 m s-1 and period 4.11 days. planetary minimum mass (m sin i) is 0.488MJ 0.015MJ. was initially detected in spring 2005 Kitt Peak National Observatory (KPNO) 0.9 coudé feed telescope. confirmed by...
An earlier study of the Kepler Mission noise properties on time scales primary relevance to detection exoplanet transits found that higher than expected followed a large extent from stars, rather instrument or data analysis performance. The over first six quarters is extended full four years ultimately comprising mission. Efforts improve pipeline have been successful in reducing levels modestly as evidenced by smaller values derived current products. new analyses transit show significant...
We discuss the ongoing development of single-mode fiber Fabry-Perot (FFP) Interferometers as precise astrophotonic calibration sources for high precision radial velocity (RV) spectrographs. FFPs are simple, inexpensive, monolithic units that can yield a stable and repeatable output spectrum. An FFP is unique alternative to traditional etalon, interferometric cavity made rather than an air-gap spacer. This design allows excellent collimation, spectral finesse, rigid mechanical stability,...
Abstract Barnard’s star is among the most studied stars given its proximity to Sun. It often considered radial velocity (RV) standard for fully convective due RV stability and equatorial decl. Recently, an <?CDATA $M\sin i=3.3{M}_{\oplus }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>M</mml:mi> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> <mml:mo>=</mml:mo> <mml:mn>3.3</mml:mn> <mml:msub> <mml:mrow> </mml:mrow> <mml:mo>⊕</mml:mo> </mml:msub> </mml:math>...