Now showing items 1-14 of 14

• #### An astro-comb calibrated solar telescope to search for the radial velocity signature of Venus ﻿

(2016)
We recently demonstrated sub-m/s sensitivity in measuring the radial velocity (RV) between the Earth and Sun using a simple solar telescope feeding the HARPS-N spectrograph at the Italian National Telescope, which is ...
• #### Calibration of an Astrophysical Spectrograph Below 1 m/s Using a Laser Frequency Comb ﻿

(Optical Society of America, 2012)
We deployed two wavelength calibrators based on laser frequency combs (“astro-combs”) at an astronomical telescope. One astro- comb operated over a 100 nm band in the deep red (∼ 800 nm) and a second operated over a 20 nm ...
• #### Characterizing K2 Planet Discoveries: A Super-Earth Transiting the Bright K Dwarf Hip 116454 ﻿

(IOP Publishing, 2015)
We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 ...
• #### Conjugate Fabry–Perot Cavity Pair for Improved Astro-Comb Accuracy ﻿

(Optical Society of America, 2012)
We propose a new astro-comb mode-filtering scheme composed of two Fabry–Perot cavities (coined “conjugate Fabry–Perot cavity pair”). Simulations indicate that this new filtering scheme makes the accuracy of astro-comb ...
• #### An Earth-sized planet with an Earth-like density ﻿

(Springer Nature, 2013)
Recent analyses1–4 of data from the NASA Kepler spacecraft5 have established that planets with radii within 25 per cent of Earth’s (R⊕) are commonplace throughout the Galaxy, orbiting at least 16.5 per cent of Sun-like ...
• #### HARPS-N Observes the Sun as a Star ﻿

(IOP Publishing, 2015)
Radial velocity (RV) perturbations induced by stellar surface inhomogeneities including spots, plages and granules currently limit the detection of Earth-twins using Doppler spectroscopy. Such stellar noise is poorly ...
• #### In-Situ Determination of Astro-Comb Calibrator Lines to Better Than 10 cm $s^{-1}$ ﻿

(Optical Society of America (OSA), 2010)
Improved wavelength calibrators for high-resolution astrophysical spectrographs will be essential for precision radial velocity (RV) detection of Earth-like exoplanets and direct observation of cosmological deceleration. ...
• #### In-situ determination of astro-comb calibrator lines to better than $\textrm{10 cm s}^{-1}$ ﻿

(Optical Society of America, 2010)
Improved wavelength calibrators for high-resolution astrophysical spectrographs will be essential for precision radial velocity (RV) detection of Earth-like exoplanets and direct observation of cosmological deceleration. ...
• #### The Kepler-10 planetary system revisited by HARPS-N: A hot rocky world and a solid Neptune-mass planet. ﻿

(IOP Publishing, 2014)
Kepler-10b was the first rocky planet detected by the Kepler satellite and confirmed with radial velocity follow-up observations from Keck-HIRES. The mass of the planet was measured with a precision of around 30%, which ...
• #### The Mass of Kepler-93b and the Composition of Terrestrial Planets ﻿

(IOP Publishing, 2015)
Kepler-93b is a 1.478 ± 0.019 R⊕ planet with a 4.7 day period around a bright (V = 10.2), astroseismically characterized host star with a mass of 0.911 ± 0.033 M and a radius of 0.919 ± 0.011 R. Based on 86 radial velocity ...
• #### ﻿Optimization of Filtering Schemes for Broadband Astro-Combs ﻿

(Optical Society of America, 2012)
To realize a broadband, large-line-spacing astro-comb, suitable for wavelength calibration of astrophysical spectrographs, from a narrowband, femtosecond laser frequency comb (“source-comb”), one must integrate the source-comb ...
• #### PISCO: the Parallel Imager for Southern Cosmology Observations ﻿

(Society of Photo-optical Instrumentation Engineers, 2014)
We present the design and lab performance of the Parallel Imager for Southern Cosmology Observations (PISCO), a photometer for the 6.5 m diameter Magellan telescopes that produces gl, rl, il, and zl band images simulta- ...
• #### Transiting Exoplanet Survey Satellite ﻿

(SPIE-Intl Soc Optical Eng, 2014)
The Transiting Exoplanet Survey Satellite (TESS) will search for planets transiting bright and nearby stars. TESS has been selected by NASA for launch in 2017 as an Astrophysics Explorer mission. The spacecraft will be ...
• #### Visible Wavelength Astro-Comb ﻿

(Optical Society of America (OSA), 2010)
We demonstrate a tunable laser frequency comb operating near 420 nm with mode spacing of 20-50 GHz, usable bandwidth of 15 nm and output power per line of ~20 nW. Using the TRES spectrograph at the Fred Lawrence Whipple ...