Boss, Alan P., Keiser, Sandra A., Ipatov, Sergei I., Myhill, Elizabeth A., Vanhala, Harri A. T.
The discovery of decay products of a short-lived radioisotope (SLRI) in the Allende meteorite led to the hypothesis that a supernova shock wave transported freshly synthesized SLRI to the presolar...
The Carnegie Astrometric Planet Search Program (2009)
Boss, Alan P., Weinberger, Alycia J., Anglada-Escude, Guillem, Thompson, Ian B., Burley, Gregory, Birk, Christoph, ...
We are undertaking an astrometric search for gas giant planets and brown dwarfs orbiting nearby low mass dwarf stars with the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile. We have...
Detectability of Terrestrial Planets in Multi-Planet Systems: Preliminary Report (2009)
Traub, Wesley A., Beichman, Charles, Boden, Andrew F., Boss, Alan P., Casertano, Stefano, Catanzarite, Joseph, ...
We ask if Earth-like planets (terrestrial mass and habitable-zone orbit) can be detected in multi-planet systems, using astrometric and radial velocity observations. We report here the preliminary...
The collapse and fragmentation of initially prolate and oblate, magnetic molecular clouds is calculated in three dimensions with a gravitational, radiative hydrodynamics code. The code includes...
The disk instability mechanism for giant planet formation is based on the formation of clumps in a marginally-gravitationally unstable protoplanetary disk, which must lose thermal energy through a...
Low Mass Companions for Five Solar-Type Stars from the Magellan Planet Search Program (2008)
Minniti, Dante, Butler, R. Paul, Lopez-Morales, Mercedes, Shectman, Stephen A., Adams, Fred C., Arriagada, Pamela, ...
We report low mass companions orbiting five Solar-type stars that have emerged from the Magellan precision Doppler velocity survey, with minimum (Msini) masses ranging from 1.2 to 25 Mjup. These...
Boss, Alan P., Ipatov, Sergei I., Keiser, Sandra A., Myhill, Elizabeth A., Vanhala, Harri A. T.
Cosmochemical evidence for the existence of short-lived radioisotopes (SLRI) such as $^{26}$Al and $^{60}$Fe at the time of the formation of primitive meteorites requires that these isotopes were...
Flux-Limited Diffusion Approximation Models of Giant Planet Formation by Disk Instability (2008)
Both core accretion and disk instability appear to be required as formation mechanisms in order to explain the entire range of giant planets found in extrasolar planetary systems. Disk instability is...
The discovery of refractory grains amongst the particles collected from Comet 81P/Wild 2 by the Stardust spacecraft (Brownlee et al. 2006) provides the ground truth for large-scale transport of...
Commission 53: Extrasolar Planets (2008)
Mayor, Michel, Boss, Alan P., Butler, Paul R., Hubbard, William B., Ianna, Philip A., Kürster, Martin, ...
Commission 53 on Extrasolar Planets was created at the 2006 Prague General Assembly of the IAU, in recognition of the outburst of astronomical progress in the field of extrasolar planet discovery,...
An m sin i = 24 Earth Mass Planetary Companion To The Nearby M Dwarf GJ 176 (2007)
Endl, Michael, Cochran, William D., Wittenmyer, Robert A., Boss, Alan P.
We report the detection of a planetary companion with a minimum mass of m sin i = 0.0771 M_Jup = 24.5 M_Earth to the nearby (d = 9.4 pc) M2.5V star GJ 176. The star was observed as part of our M...
Testing Disk Instability Models for Giant Planet Formation (2007)
Disk instability is an attractive yet controversial means for the rapid formation of giant planets in our solar system and elsewhere. Recent concerns regarding the first adiabatic exponent of...
Signatures of Planet Formation in Gravitationally Unstable Disks (2007)
Jang-Condell, Hannah, Boss, Alan P.
In this paper, we calculate simulated scattered light images of a circumstellar disk in which a planet is forming by gravitational instability. The simulated images bear no correlation to the...
Isotopic abundances of short-lived radionuclides such as 26Al provide the most precise chronometers of events in the early solar system, provided that they were initially homogeneously distributed....
The collapse and fragmentation of initially filamentary, magnetic molecular clouds is calculated in three dimensions with a gravitational, radiative hydrodynamics code. The code includes magnetic...
Working Group on Extrasolar Planets (2007)
Boss, Alan P., Butler, R. Paul, Hubbard, William B., Ianna, Philip A., Kürster, Martin, Lissauer, Jack J., ...
The Working Group on Extrasolar Planets (hereafter the WGESP) was created at a meeting of the IAU Executive Council in 1999 as a Working Group of IAU Division III and was renewed for three more years...
A Re-appraisal of the Habitability of Planets Around M Dwarf Stars (2006)
Tarter, Jill C., Backus, Peter R., Mancinelli, Rocco L., Aurnou, Jonathan M., Backman, Dana E., Basri, Gibor S., ...
Stable, hydrogen-burning, M dwarf stars comprise about 75% of all stars in the Galaxy. They are extremely long-lived and because they are much smaller in mass than the Sun (between 0.5 and 0.08...
Rapid Formation of Super-Earths around M Dwarf Stars (2006)
While the recent microlensing discoveries of super-Earths orbiting two M dwarf stars have been taken as support for the core accretion mechanism of giant planet formation, we show here that these...
Rapid Formation of Gas Giant Planets around M Dwarf Stars (2006)
Extrasolar planet surveys have begun to detect gas giant planets in orbit around M dwarf stars. While the frequency of gas giant planets around M dwarfs so far appears to be lower than that around G...
On the Formation of Gas Giant Planets on Wide Orbits (2006)
A new suite of three dimensional radiative, gravitational hydrodynamical models is used to show that gas giant planets are unlikely to form by the disk instability mechanism at distances of ~100 AU...
On Gas-Drag Induced Rapid Migration of Solids in a Non-Uniform Solar Nebula (2003)
Haghighipour, Nader, Boss, Alan P.
We study the motions of small solids, ranging from micron-sized dust grains to meter-sized objects, in the vicinity of local pressure enhancements of a gaseous nebula. Integrating numerically, we...
On Pressure Gradients and Rapid Migration of Solids in an Inhomogeneous Solar Nebula (2002)
Haghighipour, Nader, Boss, Alan P.
We study the motions of small solids, ranging from micron-sized dust grains to 100-m objects, in the vicinity of a local density enhancement of an isothermal gaseous solar nebula. Being interested in...
Rapid Formation of Ice Giant Planets (2001)
Boss, Alan P., Wetherill, George W., Haghighipour, Nader
The existence of Uranus and Neptune presents severe difficulties for the core accretion model for the formation of ice giant planets. We suggest an alternative mechanism, namely disk instability...
Injection of Radioactivities into the Forming Solar System (2001)
Vanhala, Harri A. T., Boss, Alan P.
Meteorite studies have revealed the presence of short-lived radioactivities in the early solar system. The current data suggests that the origin of at least some of the radioactivities requires...