A5059092707- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- SAS software applications and methods
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Ionosphere and magnetosphere dynamics
- High-pressure geophysics and materials
- Astrophysical Phenomena and Observations
- Space Satellite Systems and Control
- History and Developments in Astronomy
- Geological and Geochemical Analysis
- Atomic and Subatomic Physics Research
Las Campanas Observatory
2015-2024
Carnegie Observatories
2013-2024
Carnegie Institution for Science
2013-2024
European Southern Observatory
2024
Las Cumbres Observatory Global Telescope Network
2023
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Behavioral Tech Research, Inc.
2018
University of Hawaiʻi at Mānoa
2005
European Southern Observatory
2005
The Inamori-Magellan Areal Camera and Spectrograph (IMACS) is a wide-field, multipurpose imaging spectrograph on the Magellan-Baade telescope at Las Campanas Observatory. IMACS has two channels—f/2 f/4, each with an 8K × pixel mosaic of CCD detectors, that service widest range capabilities any major spectrograph. These include wide-field scales, 0.20'' pixel-1 0.11'' pixel-1, single-object multislit spectroscopy, integral-field spectroscopy 5'' 7'' areas sampled (Durham IFU), multiobject...
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, secondary near-Earth binary (65803) Didymos, and changing orbital period Dimorphos. A change in approximately 7 min was expected if incident momentum from DART directly transferred to target perfectly inelastic collision 1 , but studies probable impact conditions properties indicated that considerable enhancement ( β )...
ABSTRACT GJ 1214b is the most studied sub-Neptune exoplanet to date. Recent measurements have shown its near-infrared transmission spectrum be flat, pointing a high-altitude opacity source in exoplanet's atmosphere, either equilibrium condensate clouds or photochemical hazes. Many photometric observations been reported optical by different groups, though simultaneous spanning entire regime are lacking. We present an (4500–9260 Å) of 14 bins, measured with Magellan /IMACS repeatedly over...
Nearly every massive galaxy harbors a supermassive black hole (SMBH) in its nucleus. SMBH masses are millions to billions $M_{\odot}$, and they correlate with properties of spheroids their host galaxies. While the growth channels, mergers gas accretion, well established, origin remains uncertain: could have either emerged from "seeds" ($10^5-10^6 M_{\odot}$) formed by direct collapse clouds early Universe or smaller ($100 holes, end-products first stars. The latter channel would leave behind...
The short period ($0.94$-day) transiting exoplanet WASP-19b is an exceptional target for transmission spectroscopy studies, due to its relatively large atmospheric scale-height ($\sim 500$ km) and equilibrium temperature 2100$ K). Here we report on six precise spectroscopic Magellan/IMACS observations, five of which the full optical window from $0.45-0.9μ$m one targeting $0.4-0.55μ$m blue-optical range. Five these datasets are consistent with a spectrum without any significant spectral...
We present photometry of 4 transits the exoplanet WASP-4b, each with a precision approximately 500 ppm and time sampling 40-60s. have used data to refine estimates system parameters ephemerides. During two we observed short-lived, low-amplitude anomaly that interpret as occultation starspot by planet. also find evidence for pair similar anomalies in previously published photometry. The recurrence these suggests stellar rotation axis is nearly aligned orbital axis, or else star spot would not...
Abstract We confirm TOI-4201 b as a transiting Jovian-mass planet orbiting an early M dwarf discovered by the Transiting Exoplanet Survey Satellite. Using ground-based photometry and precise radial velocities from NEID Planet Finder Spectrograph, we measure mass of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>2.59</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.06</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.07</mml:mn>...
We present Keck/NIRSPEC near-IR images and Magellan/IMACS optical spectroscopy of the host galaxy GRB 031203. The is an actively star-forming at z = 0.1055 ± 0.0001. This lowest redshift to date, aside from 980425. From hydrogen Balmer lines, we infer extinction AV 3.62 0.25 or a total reddening ET(B - V) 1.17 0.1 toward sight line nebular regions. After correcting for reddening, perform emission-line analysis derive ISM temperature T 13400 2000 K electron density ne 300 cm-3. These imply...
We present near-infrared (NIR) time-series spectroscopy, as well complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was discovered within two days from estimated time explosion. The first spectrum taken merely 2.3 after explosion may be earliest yet obtained a SN Ia. most striking features in are several C I lines, λ1.0693 μm line is strongest ever observed Interestingly, no strong optical II counterparts were found, even though...
GJ 1214b is the most studied sub-Neptune exoplanet to date. Recent measurements have shown its near-infrared transmission spectrum be flat, pointing a high-altitude opacity source in exoplanet's atmosphere, either equilibrium condensate clouds or photochemical hazes. Many photometric observations been reported optical by different groups, though simultaneous spanning entire regime are lacking. We present an (4500–9260 Å) of 14 bins, measured with Magellan/IMACS repeatedly over three...
Abstract We present an analysis of the host-galaxy environment Swope Supernova Survey 2017a (SSS17a), discovery electromagnetic counterpart to a gravitational-wave source, GW170817. SSS17a occurred 1.9 kpc (in projection; 10.″2) from nucleus NGC 4993, S0 galaxy at distance 40 Mpc. Hubble Space Telescope ( HST ) pre-trigger image Magellan optical spectroscopy 4993 and location SSS17a, broadband UV-through-IR photometry 4993. The spectrum spectral-energy distribution indicate that has stellar...
Abstract We present a new ground-based optical transmission spectrum of the ultrahot Jupiter WASP-103b ( <?CDATA ${T}_{\mathrm{eq}}=2484$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mi>eq</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>2484</mml:mn> </mml:math> K). Our is result combining five transits from ACCESS survey and two LRG-BEASTS with reanalysis three archival Gemini/GMOS one VLT/FORS2...
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
Bigelow & Dressler<sup>1</sup> reported on the design and construction of IMACS - Inamori-Magellan Areal Camera Spectrograph. was installed Magellan-Baade 6.5-m telescope at Carnegie Institution's Las Campanas Observatory in Chile August, 2003, phased into regular operation remaining months that year (Osip et al<sup>2</sup>). is now most-used instrument Baade telescope, accounting for 63% nights available astronomy 2005 observing year. has two basic operating modes. A single 6-inch beam...
The JAXA Hayabusa-2 mission was approved in 2010 and launched on December 3, 2014. spacecraft will arrive at the near-Earth asteroid 162173 Ryugu 2018 where it perform a survey, land obtain surface material, then depart Dec 2019 return to Earth 2020. We observed with Herschel Space Observatory Apr 2012 far-IR thermal wavelengths, supported by several ground-based observations optical lightcurves. reanalysed previously published Subaru-COMICS AKARI-IRC merged them Spitzer-IRS data set. In...
We present medium-resolution optical (λ/Δλ ∼ 4000) and near-infrared 8000) spectral data for components of the newly discovered WISE J104915.57-531906.1AB (Luhman 16AB) brown dwarf binary. The spectra reveal strong 6708 Å Li i absorption in both Luhman 16A (8.0 ± 0.4 Å) 16B (3.8 confirming their substellar mass. Interestingly, this is first detection a T dwarf. In data, we find K at 1.168, 1.177, 1.243, 1.254 μm components. Neither nor alkali lines show low surface gravity signatures. Along...
Megacam is a large-format optical camera that can be operated at the f/5 Cassegrain foci of MMT on Mount Hopkins, Arizona, and Magellan Clay telescope Las Campanas Observatory, Chile. Megacam's focal plane composed 36 closely packed e2v CCD42-90 CCDs, each with 2048 × 4608 pixels, assembled in an 18,432 array. Two additional CCD42-90s are provided for autoguiding focus control. The CCDs have 13.5 μm square pixels subtend foci, yielding 25' field-of-view. system includes shutter, two filter...
We report the discovery of HATS-70b, a transiting brown dwarf at deuterium burning limit. HATS-70b has mass Mp=12.9 +1.8/-1.6 Mjup and radius Rp=1.384 +0.079/-0.074 Rjup, residing in close-in orbit with period 1.89 days. The host star is M*=1.78 +/- 0.12 Msun A rotating vsini=40.61 +0.32/-0.35 km/s, enabling us to characterize spectroscopic transit via Doppler tomography. find that like other massive planets dwarfs previously sampled, orbits low projected-obliquity lambda=8.9 +5.6/-4.5 deg....
We present photometry of two transits the giant planet WASP-4b with a photometric precision 400–800 parts per million and time sampling 25–40 s. The midtransit times are determined to within 6 Together previously published times, data consistent constant orbital period, giving no compelling evidence for period variations that would be produced by satellite or additional planets. Analysis new photometry, in combination stellar-evolutionary modeling, gives planetary mass radius 1.237 ± 0.064...
We investigated the magnitude–phase relation of (162173) 1999 JU3, a target asteroid for JAXA Hayabusa 2 sample return mission. initially employed International Astronomical Union's H–G formalism but found that it fits less well using single set parameters. To improve inadequate fit, we two photometric functions: Shevchenko and Hapke functions. With function, exhibits linear behavior in wide phase angle range (α = 5°–75°) shows weak nonlinear opposition brightening at α < 5°, providing more...
We report on the confirmation of a transiting giant planet around relatively hot (Teff = 6801 $\pm$ 56 K) star HD2685, whose transit signal was detected in Sector 1 data TESS mission. confirmed planetary nature by using Doppler velocimetric measurements with CHIRON, CORALIE and FEROS, as well photometric CHAT LCOGT. From photometry radial velocities joint analysis, we derived following parameters for HD2685 $b$: $P$=4.12692$\pm$0.00004 days, M$_P$=1.18 0.09 $M_J$ $R_P$=1.44 0.01 $R_J$. This...