Variability in a Young, L/T Transition Planetary-Mass Object

Beth A. Biller; Johanna Vos; Mariangela Bonavita; Esther Buenzli; Claire Baxter; Ian J. M. Crossfield; Katelyn Allers; Michael C. Liu; Mickaël Bonnefoy; Niall Deacon; Wolfgang Brandner; Joshua E. Schlieder; Trent Dupuy; Taisiya Kopytova; Elena Manjavacas; France Allard; Derek Homeier; Thomas Henning

doi:10.1088/2041-8205/813/2/L23

Variability in a Young, L/T Transition Planetary-Mass Object

Beth A. Biller, Johanna Vos, Mariangela Bonavita, Esther Buenzli, Claire Baxter, Ian J. M. Crossfield, Katelyn Allers, Michael C. Liu, Mickaël Bonnefoy, Niall Deacon, Wolfgang Brandner, Joshua E. Schlieder, Trent Dupuy, Taisiya Kopytova, Elena Manjavacas, France Allard, Derek Homeier, Thomas Henning

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low mass brown dwarfs, we detect significant variability in the young, free-floating planetary mass object PSO J318.5-22, likely due to rotational modulation of inhomogeneous cloud cover. A member of the 23$\pm$3 Myr $\beta$ Pic moving group, PSO J318.5-22 has T$_\mathrm{eff}$ = 1160$^{+30}_{-40}$ K and a mass estimate of 8.3$\pm$0.5 M$_{Jup}$ for a 23$\pm$3 Myr age. PSO J318.5-22 is intermediate in mass between 51 Eri b and $\beta$ Pic b, the two known exoplanet companions in the $\beta$ Pic moving group. With variability amplitudes from 7-10$\%$ in J$_{S}$ at two separate epochs over 3-5 hour observations, we constrain the rotational period of this object to $>$5 hours. In K$_{S}$, we marginally detect a variability trend of up to 3$\%$ over a 3 hour observation. This is the first detection of weather on an extrasolar planetary mass object. Among L dwarfs surveyed at high-photometric precision ($

Original language	English
Journal	Astrophysical Journal
DOIs	https://doi.org/10.1088/2041-8205/813/2/L23
Publication status	Published - 30 Oct 2015

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astro-ph.EP

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10.1088/2041-8205/813/2/L23

Beth Biller
- bbroe.acuk
- School of Physics and Astronomy - Personal Chair of Exoplanet Characterisation
Person: Academic: Research Active

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Biller, B. A., Vos, J., Bonavita, M., Buenzli, E., Baxter, C., Crossfield, I. J. M., Allers, K., Liu, M. C., Bonnefoy, M., Deacon, N., Brandner, W., Schlieder, J. E., Dupuy, T., Kopytova, T., Manjavacas, E., Allard, F., Homeier, D., & Henning, T. (2015). Variability in a Young, L/T Transition Planetary-Mass Object. Astrophysical Journal. https://doi.org/10.1088/2041-8205/813/2/L23

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title = "Variability in a Young, L/T Transition Planetary-Mass Object",

abstract = "As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low mass brown dwarfs, we detect significant variability in the young, free-floating planetary mass object PSO J318.5-22, likely due to rotational modulation of inhomogeneous cloud cover. A member of the 23$\pm$3 Myr $\beta$ Pic moving group, PSO J318.5-22 has T$_\mathrm{eff}$ = 1160$^{+30}_{-40}$ K and a mass estimate of 8.3$\pm$0.5 M$_{Jup}$ for a 23$\pm$3 Myr age. PSO J318.5-22 is intermediate in mass between 51 Eri b and $\beta$ Pic b, the two known exoplanet companions in the $\beta$ Pic moving group. With variability amplitudes from 7-10$\%$ in J$_{S}$ at two separate epochs over 3-5 hour observations, we constrain the rotational period of this object to $>$5 hours. In K$_{S}$, we marginally detect a variability trend of up to 3$\%$ over a 3 hour observation. This is the first detection of weather on an extrasolar planetary mass object. Among L dwarfs surveyed at high-photometric precision ($",

keywords = "astro-ph.EP",

author = "Biller, {Beth A.} and Johanna Vos and Mariangela Bonavita and Esther Buenzli and Claire Baxter and Crossfield, {Ian J. M.} and Katelyn Allers and Liu, {Michael C.} and Micka{\"e}l Bonnefoy and Niall Deacon and Wolfgang Brandner and Schlieder, {Joshua E.} and Trent Dupuy and Taisiya Kopytova and Elena Manjavacas and France Allard and Derek Homeier and Thomas Henning",

note = "6 pages, 4 figures, accepted to ApJ letters",

year = "2015",

month = oct,

day = "30",

doi = "10.1088/2041-8205/813/2/L23",

language = "English",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Variability in a Young, L/T Transition Planetary-Mass Object

AU - Biller, Beth A.

AU - Vos, Johanna

AU - Bonavita, Mariangela

AU - Buenzli, Esther

AU - Baxter, Claire

AU - Crossfield, Ian J. M.

AU - Allers, Katelyn

AU - Liu, Michael C.

AU - Bonnefoy, Mickaël

AU - Deacon, Niall

AU - Brandner, Wolfgang

AU - Schlieder, Joshua E.

AU - Dupuy, Trent

AU - Kopytova, Taisiya

AU - Manjavacas, Elena

AU - Allard, France

AU - Homeier, Derek

AU - Henning, Thomas

N1 - 6 pages, 4 figures, accepted to ApJ letters

PY - 2015/10/30

Y1 - 2015/10/30

N2 - As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low mass brown dwarfs, we detect significant variability in the young, free-floating planetary mass object PSO J318.5-22, likely due to rotational modulation of inhomogeneous cloud cover. A member of the 23$\pm$3 Myr $\beta$ Pic moving group, PSO J318.5-22 has T$_\mathrm{eff}$ = 1160$^{+30}_{-40}$ K and a mass estimate of 8.3$\pm$0.5 M$_{Jup}$ for a 23$\pm$3 Myr age. PSO J318.5-22 is intermediate in mass between 51 Eri b and $\beta$ Pic b, the two known exoplanet companions in the $\beta$ Pic moving group. With variability amplitudes from 7-10$\%$ in J$_{S}$ at two separate epochs over 3-5 hour observations, we constrain the rotational period of this object to $>$5 hours. In K$_{S}$, we marginally detect a variability trend of up to 3$\%$ over a 3 hour observation. This is the first detection of weather on an extrasolar planetary mass object. Among L dwarfs surveyed at high-photometric precision ($

AB - As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low mass brown dwarfs, we detect significant variability in the young, free-floating planetary mass object PSO J318.5-22, likely due to rotational modulation of inhomogeneous cloud cover. A member of the 23$\pm$3 Myr $\beta$ Pic moving group, PSO J318.5-22 has T$_\mathrm{eff}$ = 1160$^{+30}_{-40}$ K and a mass estimate of 8.3$\pm$0.5 M$_{Jup}$ for a 23$\pm$3 Myr age. PSO J318.5-22 is intermediate in mass between 51 Eri b and $\beta$ Pic b, the two known exoplanet companions in the $\beta$ Pic moving group. With variability amplitudes from 7-10$\%$ in J$_{S}$ at two separate epochs over 3-5 hour observations, we constrain the rotational period of this object to $>$5 hours. In K$_{S}$, we marginally detect a variability trend of up to 3$\%$ over a 3 hour observation. This is the first detection of weather on an extrasolar planetary mass object. Among L dwarfs surveyed at high-photometric precision ($

KW - astro-ph.EP

U2 - 10.1088/2041-8205/813/2/L23

DO - 10.1088/2041-8205/813/2/L23

M3 - Article

SN - 0004-637X

JO - Astrophysical Journal

JF - Astrophysical Journal

ER -

Variability in a Young, L/T Transition Planetary-Mass Object

Abstract

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Beth Biller

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