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A MAGELLAN MIKE AND SPITZER MIPS STUDY OF 1.5-1.0 M☉STARS IN SCORPIUS-CENTAURUS
Open accessAbstract
We obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 μm and 70 μm observations of 182 nearby, Hipparcos F-and G-type common proper motion single and binary systems in the nearest OB association, Scorpius-Centaurus.We also obtained Magellan/MIKE R ∼ 50,000 visual spectra at 3500-10500 Å for 181 candidate ScoCen stars in single and binary systems.Combining our MIPS observations with those of other ScoCen stars in the literature, we estimate 24 μm F+G-type disk fractions of 9/27 (33% ± 11%), 21/67 (31% ± 7%), and 25/71 (35% ± 7%) for Upper Scorpius (∼10 Myr), Upper Centaurus Lupus (∼15 Myr), and Lower Centaurus Crux (∼17 Myr), respectively.We confirm previous IRAS and MIPS excess detections and present new discoveries of 41 protoplanetary and debris disk systems, with fractional infrared luminosities ranging from L IR /L * = 10 -5 to 10 -2 and grain temperatures ranging from T gr = 40-300 K.We searched for an increase in 24 μm excess at an age of 15-20 Myr, consistent with the onset of debris production predicted by coagulation N-body simulations of outer planetary systems.We found such an increase around 1.5 M stars but discovered a decrease in the 24 μm excess around 1.0 M stars.We additionally discovered that the 24 μm excess around 1.0 M stars is larger than predicted by self-stirred models.Finally, we found a weak anti-correlation between fractional infrared luminosity (L IR /L * ) and chromospheric activity (R HK ), that may be the result of differences in stellar properties, such as mass, luminosity, and/or winds.
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“Using the Upper Cen-Lup (UCL) subgroup velocity vector from Chen et al. (2011) ( U, V, W = -5.1 ± 0.6, -19.7 ± 0.4, -4.6 ± 0.3 km s -1 ), we predict the RV of an ideal UCL member at the position of J1407 to be γ = 7.0 km s -1 , with a predicted rms scatter amongst members of ± 1.3 kms -1 .”
From Mass and period limits on the ringed companion transiting the young star J1407 (2015) · cites this paper as Chen et al. 2011
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Metadata
- Authors
- Chen, C. H., Mamajek, E. E., Bitner, M. A., Pecaut, M., Su, K. Y. L., & Weinberger, A. J.
- Affiliations
- Space Telescope Science Institute (US)
- University of Rochester (US)
- University of Arizona (US)
- Carnegie Institution for Science (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2011-08-18
- Volume
- 738
- Issue
- 2
- Pages
- 122
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2068806560
- Cited by
- 138
- References
- 86
- Citations by year
- 2026: 3 · 2025: 2 · 2023: 6 · 2022: 4 · 2021: 5 · 2020: 13 · 2019: 6 · 2018: 13 · 2017: 11 · 2016: 15 · 2015: 16 · 2014: 13 · 2013: 17 · 2012: 14
- FWCI
- 7.34
- Type
- journal article
- Language
- he
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- Funders
- National Aeronautics and Space Administration
- California Institute of Technology
- Jet Propulsion Laboratory
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- Scorpius-Centaurus OB association, protoplanetary disks, debris disks, disk fraction, stellar ages, Upper Scorpius, Upper Centaurus Lupus, Lower Centaurus Crux, chromospheric activity, stellar winds, binary stars
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