A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group

By A. Binks, R. Jeffries. 2013

175 citations recorded by the source corpus.

Optical spectroscopy is used to confirm membership for 8 low- mass candidates in the young Beta Pic moving group (BPMG) via their radial velocities, chromospheric activity and kinematic parallaxes. We searched for the presence of the Li I 6708 ˚ A resonance feature and combined the results with literature measurements of other BPMG members to find the agedependent lithium depletion boundary (LDB) ‐ the luminosity at which Li remains unburned in a coeval group. The LDB age of the BPMG is 21 ± 4 Myr and insensitive to the choice of low-mass evolutionary models. This age is more precise, likely to be more accurate, and much older than that commonly assumed for the BPMG. As a result, substellar and planetary companions of BPMG members will be more massive than previously thought.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/d89c4bc26d40be8ffb8bed66cdd067ff0ea63d9d

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In Astronomy and Astrophysics

Citations in the corpus

Imaging Extrasolar Giant Planets (2016, background): “…star-forming regions and young moving groups in particular have been systematically adjusted to older ages over the past few years, which has propagated to the ages and masses of planets in those 10 associations (Pecaut et al. 2012; Binks & Jeffries 2014; Kraus et al. 2014b; Bell et al. 2015).”
The star formation history and accretion-disc fraction among the K-type members of the Scorpius–Centaurus OB association (2016, methodology): “LDB ages have been calculated for several of the nearby, young moving groups (Mentuch et al. 2008; Binks & Jeffries 2014) but the subgroups of Sco-Cen do not yet have a reliable LDB age.”
Individual Dynamical Masses of Ultracool Dwarfs (2017, methodology): “Lithium Fusion Mass Limit Theoretical predictions of lithium depletion in ultracool dwarfs as a function of mass and age are thought to be one of the most reliable methods for age-dating young clusters (e.g., Chabrier et al. 1996; Bildsten et al. 1997; Binks & Jeffries 2014; Kraus et al. 2014).”
HAZMAT. I. THE EVOLUTION OF FAR-UV AND NEAR-UV EMISSION FROM EARLY M STARS (2014, background): “Cooler stars have FUV and NUV fluxes strongly dominated by stellar activity (e.g., Robinson 3 Binks & Jeffries (2014) places the β Pic YMG at 21 ± 4 Myrs.”
A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood (2015, background): “…Kiss et al. (2011), Rodriguez et al. (2011), Zuckerman et al. (2011), Schlieder, Lépine, & Simon (2012a), Schlieder, Lépine, & Simon (2012b), Shkolnik et al. (2012), Binks & Jeffries (2014), Ducourant et al. (2014), Kraus et al. (2014), Riedel et al. (2014), and Shvonski et al. (in preparation).”
On the age of the β Pictoris moving group (2014, methodology): “…for the Fand G-type BPMG members compared to theoretical model isochrones (this study), (3) the isochronal ages for the preMS K- and M-type stars when including a treatment for magnetic fields (Malo et al. 2014b), and (4) the Li depletion boundary (Binks & Jeffries 2014; Malo et al. 2014b).”
BANYAN. VII. A NEW POPULATION OF YOUNG SUBSTELLAR CANDIDATE MEMBERS OF NEARBY MOVING GROUPS FROM THE BASS SURVEY (2015, background): “…et al. 1989; Kastner et al. 1997; Zuckerman & Song 2004; Weinberger et al. 2013), β Pictoris (βPMG; 20–26 Myr; Zuckerman et al. 2001a; Malo et al. 2014b; Binks & Jeffries 2014), Tucana-Horologium (THA; 20–40 Myr; Torres et al. 2000; Zuckerman & Webb 2000; Zuckerman et al. 2001b; Kraus et al.…”
Stellar magnetism: empirical trends with age and rotation (2014, unknown): “…42: Strassmeier et al. (2003); 43: Wichmann, Schmitt & Hubrig (2003); 44: Stauffer, Schultz & Kirkpatrick (1998); 45: Messina et al. (2003); 46: Binks & Jeffries (2014); 47: Donati et al. (2003); 48: Kovári et al. (2004); 49: Barrado y Navascués, Stauffer & Jayawardhana (2004); 50: Fares…”
PLANETS AROUND LOW-MASS STARS (PALMS). IV. THE OUTER ARCHITECTURE OF M DWARF PLANETARY SYSTEMS (2014, background): “For example, Binks & Jeffries (2014) find an older age of 21 ± 4 for the β Pic YMG from its Li-depletion boundary compared to its isochronal age of ≈12 Myr.”
Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager (2015, unknown): “K color of GJ 3305, and its lithium equivalent width as measured by Feigelson et al. ( 50 ), is consistent with placement of GJ 3305 at one edge of the lithium depletion region for stars in the BPMG, as indicated in Figure 2 in Binks & Jeffries ( 64 ).”