B. Goldman
A5088090428- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Planetary Science and Exploration
- Calibration and Measurement Techniques
- Inertial Sensor and Navigation
- Climate Change Communication and Perception
- Advanced Database Systems and Queries
- Conferences and Exhibitions Management
- Atmospheric Ozone and Climate
- Data Management and Algorithms
- CCD and CMOS Imaging Sensors
Observatoire astronomique de Strasbourg
2015-2025
Max Planck Institute for Astronomy
2013-2023
Université de Strasbourg
2015-2022
Centre National de la Recherche Scientifique
2002-2022
Max Planck Institute for Nuclear Physics
2018
Max Planck Society
2009-2015
Max Planck Innovation
2010
CEA Paris-Saclay
1999-2009
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1999-2009
Goldman Sachs (United States)
2009
We present a new compilation of Type Ia supernovae (SNe Ia), dataset low-redshift nearby-Hubble-flow SNe and analysis procedures to work with these heterogeneous compilations. This ``Union'' 414 SN Ia, which reduces 307 after selection cuts, includes the recent large samples from Supernova Legacy Survey ESSENCE Survey, older datasets, as well recently extended distant observed HST. A single, consistent blind procedure is used for all various subsamples, implemented that consistently weights...
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
Aims. The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called "machos") could be a major component of dark matter Milky Way galaxy. To this end, monitored over 6.7 years stars in Magellanic clouds for microlensing events caused by such objects.
We present spectra for 12 new ultracool dwarfs found in the DENIS infrared survey. Seven of them have spectral types at bottom M-class (M8–M9.5), and other five belong to cooler "L" class. also two L by EROS 2 proper-motion introduce a scheme dwarf classification that is based on an extension pseudocontinuum ratio previously defined M dwarfs. For calibrating subclasses, we use temperature scale late-M recently obtained Basri et al. from synthetic spectrum fitting high-resolution profiles Cs...
Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started 2010. VVV targets 562 sq. deg Galactic bulge and an adjacent plane region is expected to run for about five years.
We present the details of photometric and astrometric calibration Pan-STARRS1 $3\pi$ Survey. The goals were to reduce systematic effects introduced by camera detectors, place all observations onto a system with consistent zero points over entire area surveyed, ~30,000 square degrees north $\delta$ = -30 degrees. compensates for similar so that positions, proper motions, parallaxes are reliable as well. Pan-STARRS Data Release 2 (DR2) astrometry is tied Gaia DR1 release.
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
We present Keck HIRES spectra of 6 late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures the objects using detailed atmospheric models fine analysis alkali resonance absorption lines CsI RbI. These yield mutually consistent results (+-150 K) when we use ``cleared-dust'' models, which account for removal refractory species from molecular states but do not include dust opacities. find a tendency RbI line imply slightly higher temperature, ascribe an incomplete treatment...
We present a catalogue of rotation and chromospheric activity in sample 334 M dwarfs spectral types M0--M4.5 populating the parameter space around boundary to full convection. obtained high-resolution optical spectra for 206 targets determined projected rotational velocity, vsini, Halpha emission. The data are combined with measurements vsini field stars same type from literature. Our adds 157 new existing literature almost doubles available vsini. final provides statistically meaningful...
We report the first astrometrically determined mass of an extrasolar planet, a companion previously detected by Doppler spectroscopy. Radial velocities provided ephemeris with which to schedule significant fraction {\it HST} observations near peri- and apastron. The astrometry residuals at these orbital phases exhibit systematic deviation consistent perturbation due planetary companion. Combining radial velocities, we solve for proper motion, parallax, size, inclination, position angle line...
We present results from the "Weather on Other Worlds" Spitzer Exploration Science program to investigate photometric variability in L and T dwarfs, usually attributed patchy clouds. surveyed 44 L3-T8 spanning a range of $J-K_s$ colors surface gravities. find that 14/23 (61%; 95% confidence interval: 41%-78%) our single L3-L9.5 dwarfs are variable with peak-to-peak amplitudes between 0.2% 1.5%, 5/16 (31%; 14%-56%) T0-T8 0.8% 4.6%. After correcting for sensitivity, we 80% (95% 53%-100%) vary...
We present a panoramic map of the entire Milky Way halo north |$\delta \sim -30{^\circ }$| (∼30 000 deg2), constructed by applying matched-filter technique to Pan-STARRS1 3π Survey data set. Using single-epoch photometry reaching g ∼22, we are sensitive stellar substructures with heliocentric distances between 3.5 and ∼35 kpc. recover almost all previously reported streams in this volume demonstrate that several these significantly more extended than earlier sets have indicated. In addition,...
We present two epochs of MPG/ESO 2.2 m GROND simultaneous six-band (r'i'z' JHK) photometric monitoring the closest known L/T transition brown dwarf binary WISE J104915.57−531906.1AB. report here first resolved variability both T0.5 and L7.5 components. obtained 4 hr focused observations on night 2013 April 22 (UT), as well defocused (unresolved) 16 (UT). note a number robust trends in our light curves. The r' i' curves appear to be anti-correlated with z' H for component unresolved curve. In...
We report the discovery of tidal structures around intermediate-aged ($\sim$ 700--800~Myr), nearby ($\sim85$~pc) star cluster Coma Berenices. The spatial and kinematic grouping stars is determined with {\it Gaia} DR2 parallax proper motion data, by a clustering analysis tool, \textsc{StarGO}, to map 5D parameters ($X, Y, Z$, $μ_α\cosδ, μ_δ$) onto 2D neural network. A leading trailing tails, each an extension $\sim50$~pc are revealed for first time this disrupting cluster. members, totaling...
We searched for long-duration microlensing events originating from intermediate-mass black holes (BH) in the halo of Milky Way, using archival data EROS-2 and MACHO photometric surveys towards Large Magellanic Cloud (LMC). combined these two to create a common database light curves 14.1 million objects LMC, covering total duration 10.6 years, with flux series measured four wide passbands. carried out search on curves, complemented by 22.7 objects, observed only or MACHO, over about 7 A...
Five years of eros data towards the Small Magellanic Cloud have been searched for gravitational microlensing events, using a new, more accurate method to assess impact stellar blending on efficiency. Four long-duration candidates found which, if they are hint at non-halo population lenses. Combined with results from other observation programs, this analysis yields strong limits amount Galactic dark matter made compact objects. Less than 25% standard halo can be composed objects mass between...
Benchmark brown dwarfs are those objects for which fiducial constraints available, including effective temperature, parallax, age, metallicity. We searched new cool in 186 sq.deg. of the area covered by data release DR5+ UKIDSS Large Area Survey. Follow-up optical and near-infrared broad-band photometry, methane imaging four promising candidates, revealed three with distinct absorption, typical mid- to late-T dwarfs, one possibly T4 dwarf. The latest-type object, classified as T8-9, shares...
We present an extensive new time-series of spectroscopic data the peculiar SN 1999aa in NGC 2595. Our set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing unusually complete time history. The early resemble those a 1991T-like object but relatively strong Ca H&K absorption feature. first clear sign Si II 6355, characteristic Type Ia supernovae, is found at day -7 its velocity remains constant up least month after light. transition...
We fit the data for binary lens microlensing event MACHO 98-SMC-1 from five different collaborations and find two distinct solutions characterized by separation d mass ratio q: (d,q) = (0.54,0.50) (3.65,0.36), where is in units of Einstein radius. However, relative proper motion very similar solutions, 1.30 km s-1 kpc-1 1.48 kpc-1, thus confirming that Small Magellanic Cloud. The close can be either rotating or approximately static but wide must at to its maximum allowed rate consistent with...
Aims.We present a new EROS-2 measurement of the microlensing optical depth toward Galactic Bulge.
We present results from the PARallaxes of Southern Extremely Cool objects (PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using Wide Field Imager on ESO 2.2 m telescope. The presented here include 10 targets observations over 18 months a first version proper motion catalog. motions were obtained by combining PARSEC astrometrically reduced with respect Second US Naval Observatory CCD Astrograph Catalog, Two...
The discovery and subsequent detailed study of T dwarfs have provided many surprises pushed the physics modelling cool atmospheres in unpredicted directions. Distance is a critical parameter for studies these objects to determine intrinsic luminosities, test binarity measure their motion Galaxy. We describe new observational programme distances across full range T-dwarf subtypes using New Technology Telescope (NTT)/SOFI telescope/instrument combination. present preliminary results ten...
(Abridged) We aim at identifying the least massive population of solar metallicity, young (120 Myr), nearby (133.5 pc) Pleiades star cluster with ultimate goal understanding physical properties intermediate-age, free-floating, low-mass brown dwarfs and giant planetary-mass objects, deriving substellar mass function across deuterium-burning limit ~0.012 Msol. performed a deep photometric astrometric J- H-band survey covering an area ~0.8 deg^2. The images completeness limiting magnitudes J,H...