Debris Disks in the Upper Scorpius OB Association (2009)
Carpenter, John M., Mamajek, Eric E., Hillenbrand , Lynne A., Meyer, Michael R.
We present MIPS 24 μm and 70 μm photometry for 205 members of the Upper Scorpius OB Association. These data are combined with published MIPS photometry for 15 additional association members to...
Debris Disks in the Upper Scorpius OB Association (2009)
Carpenter, John M., Mamajek, Eric E., Hillenbrand, Lynne A., Meyer, Michael R.
We present MIPS 24um and 70um photometry for 205 members of the Upper Scorpius OB Association. These data are combined with published MIPS photometry for 15 additional association members to assess...
Initial Conditions of Planet Formation: Lifetimes of Primordial Disks (2009)
The statistical properties of circumstellar disks around young stars are important for constraining theoretical models for the formation and early evolution of planetary systems. In this brief...
How accurately can we age-date solar-type dwarfs using activity/rotation diagnostics? (2009)
It is well established that activity and rotation diminishes during the life of sun-like main sequence (~F7-K2V) stars. Indeed, the evolution of rotation and activity among these stars appears to be...
Carpenter, John M., Bouwman, Jeroen, Mamajek, Eric E., Meyer, Michael R., Hillenbrand, Lynne A., Backman, Dana E., ...
We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems Legacy program. These data are...
Olling, Rob P., Allen, Ron J., Anderson, Jay, Chaboyer, Brian C., Freedman, Wendy, Guhathakurta, Puragra, ...
Abridged: The golden age of astrophysics is upon us with both grand discoveries (extra-solar planets, dark matter, dark energy) and precision cosmology. Fundamental understanding of the working of...
Kenworthy, Matthew A., Mamajek, Eric E., Hinz, Philip M., Meyer, Michael R., Heinze, Aren N., Miller, Douglas L., ...
A candidate < 3 Jupiter mass, extrasolar planet was recently imaged by Kalas et al. (2008) using HST/ACS at 12.7" (96 AU) separation from the nearby (d = 7.7 pc) young (~200 Myr) A2V star Fomalhaut....
Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics (2008)
Mamajek, Eric E., Hillenbrand, Lynne A.
While the strong anticorrelation between chromospheric activity and age has led to the common use of the Ca II H and K emission index (R'_(HK) = L_(HK)/L_(bol)) as an empirical age estimator for...
Carpenter, John M., Bouwman, Jeroen, Mamajek, Eric E., Meyer, Michael R., Hillenbrand, Lynne A., Backman, Dana E., ...
We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems (FEPS) Legacy program. These data...
A Survey for a Coeval, Comoving Group Associated with HD 141569 (2008)
Aarnio, Alicia N., Weinberger, Alycia J., Stassun, Keivan G., Mamajek, Eric E., James, David J.
We present results of a search for a young stellar moving group associated with the star HD 141569, a nearby, isolated Herbig AeBe primary member of a 5+/-3 Myr-old triple star system on the...
Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics (2008)
Mamajek, Eric E., Hillenbrand, Lynne A.
While the strong anti-correlation between chromospheric activity and age has led to the common use of the Ca II H & K emission index (R'_HK = L_HK/L_bol) as an empirical age estimator for solar type...
Harvey, Paul M., Huard, Tracy L., Jørgensen, Jes K., Gutermuth, Robert A., Mamajek, Eric E., Bourke, Tyler L., ...
We present observations of two areas totalling 0.57 deg^2 in the IC 5146 star-forming region at 3.6, 4.5, 5.8, 8.0, 24, and 70 μm observed with the Spitzer Space Telescope. We reexamine the issue of...
The moth : an unusual circumstellar structure associated with HD 61005 (2007)
Hines, Dean C., Schneider, Glenn, Hollenbach, David, Mamajek, Eric E., Hillenbrand, Lynne A., Metchev, Stanimir A., ...
We present the discovery of an unusual spatially resolved circumstellar structure associated with the ≈90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science...
Mamajek, Eric E., Meyer, Michael R.
We introduce an alternative hypothesis to explain the very low luminosity of the cool (L-type) companion to the ~25 M_Jup ~8 Myr-old brown dwarf 2M1207A. Recently, Mohanty et al. (2007) found that...
On the Distance to the Ophiuchus Star-Forming Region (2007)
The Ophiuchus molecular cloud complex has produced in Lynds 1688 the richest known embedded cluster within ~300 pc of the Sun. Unfortunately, distance estimates to the Oph complex vary by nearly ~40%...
A Splinter Session on the Thorny Problem of Stellar Ages (2007)
Mamajek, Eric E., Navascues, David Barrado Y, Randich, Sofia, Jensen, Eric L. N., Young, Patrick A., Miglio, Andrea, ...
Accurate stellar ages remain one of the most poorly constrained, but most desired, astronomical quantities. Here we briefly summarize some recent efforts to improve the stellar age scale from a...
Are debris disks and massive planets correlated? (2007)
Moro-Martín, Amaya, Carpenter, John M., Meyer, Michael R., Hillenbrand, Lynne A., Malhotra, Renu, Hollenbach, David, ...
Using data from the Spitzer Space Telescope Legacy Science Program Formation and Evolution of Planetary Systems (FEPS), we have searched for debris disks around nine FGK stars (2-10 Gyr), known from...
The moth: an unusual circumstellar structure associated with HD 61005 (2007)
Hines, Dean C., Schneider, Glenn, Hollenbach, David, Mamajek, Eric E., Hillenbrand, Lynne A., Metchev, Stanimir A., ...
We present the discovery of an unusual spatially resolved circumstellar structure associated with the ~90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science survey...
Dean C. Hines, Glenn Schneider, David Hollenbach, Eric E. Mamajek, Lynne A. Hillenbr, Stanimir A. Metchev, ...
We present the discovery of an unusual spatially resolved circumstellar structure associated with the ≈90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science...
Are Debris Disks and Massive Planets Correlated? (2006)
Moro-Martín, Amaya, Carpenter, John M., Meyer, Michael R., Hillenbrand, Lynne A., Malhotra, Renu, Hollenbach, David, ...
Using data from the Spitzer Space Telescope Legacy Science Program ``Formation and Evolution of Planetary Systems'' (FEPS), we have searched for debris disks around 9 FGK stars (2-10 Gyr), known from...
Carpenter, John M., Mamajek, Eric E., Hillenbrand, Lynne A., Meyer, Michael R.
We present 4.5, 8, and 16um photometry from the Spitzer Space Telescope for 204 stars in the Upper Scorpius OB Association. The data are used to investigate the frequency and properties of...
Spitzer 24 Micron Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars (2006)
Siegler, Nick, Muzerolle, James, Young, Erick T., Rieke, George H., Mamajek, Eric E., Trilling, David E., ...
We present 24 micron Spitzer/MIPS photometric observations of the ~50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3-M5 were observed in the central square...
A New Nearby Candidate Star Cluster in Ophiuchus at d = 170 pc (2006)
The recent discoveries of nearby star clusters and associations within a few hundred pc of the Sun, as well as the order of magnitude difference in the formation rates of the embedded and open...
A Distributed Population of Low Mass Pre-Main Sequence Stars near the Taurus Molecular Clouds (2006)
Slesnick, Catherine L., Carpenter, John M., Hillenbrand, Lynne A., Mamajek, Eric E.
We present a drift scan survey covering a ~5 deg by 50 deg region toward the southern portion of the Taurus-Auriga molecular cloud. Data taken in the B,R,I filters with the Quest-2 camera on the...
Hines, Dean C., Backman, Dana E., Bouwman, Jeroen, Hillenbrand, Lynne A., Carpenter, John M., Meyer, Michael R., ...
We report the discovery of a debris system associated with the ~30 Myr old G3/5V star HD 12039 using Spitzer Space Telescope observations from 3.6-160 mum. An observed infrared excess...
A Moving Cluster Distance to the Exoplanet 2M1207 B in the TW Hya Association (2005)
A candidate extrasolar planet companion to the young brown dwarf 2MASSW J1207334-393254 (2M1207) was recently discovered by Chauvin et al. They find that 2M1207 B's temperature and luminosity are...
Formation and Evolution of Planetary Systems: Cold Outer Disks Associated with Sun-like stars (2005)
Kim, Jinyoung Serena, Hines, Dean C., Backman, Dana E., Hillenbrand, Lynne A., Meyer, Michael R., Rodmann, Jens, ...
We present the discovery of debris systems around three solar mass stars based upon observations performed with the Spitzer Space Telescope as part of a Legacy Science Program, ``the Formation and...
The recent availability of accurate proper motion catalogs for millions of stars on the sky (e.g. Tycho-2, UCAC) can benefit projects for which age estimates are needed for stars that are plausibly...
Close, Laird M., Lenzen, Rainer, Guirado, Jose C., Nielsen, Eric L., Mamajek, Eric E., Brandner, Wolfgang, ...
Mass is the most fundamental parameter of a star, yet it is also one of the most difficult to measure directly. In general, astronomers estimate stellar masses by determining the luminosity and using...
Formation and evolution of planetary systems: Cold outer disks associated with sun-like stars (2005)
Kim, Jinyoung Serena, Hines, Dean C., Backman, Dana E., Hillenbrand, Lynne A., Meyer, Michael R., Rodmann, Jens, ...
We present the discovery of debris systems around three Sun-like stars based on observations performed with the Spitzer Space Telescope as part of a Legacy Science Program, ``The Formation and...
Mamajek, Eric E., Meyer, Michael R., Hinz, Philip M., Hoffmann, William F., Cohen, Martin, Hora, Joseph L.
We have conducted an N-band survey of 14 young stars in the ~30 Myr-old Tucana-Horologium Association to search for evidence of warm, circumstellar dust disks. Using the MIRAC-BLINC camera on the...
Siegler, Nick, Close, Laird M., Mamajek, Eric E., Freed, Melanie
A survey of 30 nearby M6.0-M7.5 dwarfs with Ks0.8, Delta Ks20 AU) very low mass (M_{tot}3 AU. This binary frequency is less than the ~32% measured among early M dwarfs over the same separation range....
Solar-Type Post-T Tauri Stars in the Nearest OB Subgroups (2003)
I discuss results from the recent spectroscopic survey for solar-type pre-MS stars in the Lower Centaurus-Crux (LCC) and Upper Centaurus-Lupus (UCL) OB subgroups by Mamajek, Meyer, & Liebert (2002,...
Post-T Tauri Stars in the Nearest OB Association (2002)
Mamajek, Eric E., Meyer, Michael R., Liebert, James
We present results of a spectroscopic survey of X-ray- and proper motion-selected samples of late-type stars in the Lower Cen-Cru (LCC) and Upper Cen-Lup (UCL) subgroups of the nearest OB...
A disrupted circumstellar torus inside eta Carinae's Homunculus Nebula (2002)
Smith, Nathan, Gehrz, Robert D., Hinz, Phillip M., Hoffmann, William F., Mamajek, Eric E., Meyer, Michael R., ...
We present thermal infrared images of the bipolar nebula surrounding eta Carinae at six wavelengths from 4.8 to 24.5 microns. These were obtained with the MIRAC3 camera system at the Magellan...
Lawson, Warrick A., Crause, Lisa A., Mamajek, Eric E., Feigelson, Eric D.
A limited-area survey of the eta Chamaeleontis cluster has identified 2 new late-type members. The more significant of these is ECHA J0843.3-7905 (= IRAS F08450-7854), a slowly-rotating (P = 12 d) M2...
The Eta Chamaeleontis Cluster: Origin in the Sco-Cen OB Association (2000)
Mamajek, Eric E., Lawson, Warrick A., Feigelson, Eric D.
A young, nearby compact aggregate of X-ray emitting pre-main sequence stars was recently discovered in the vicinity of eta Cha (B8V). In this paper, we further investigate this cluster: its...