Optical and Radio Observations of the T Tauri Binary KH 15D (V582 Mon): Stellar Properties, Disk Mass Limit, and Discovery of a CO Outflow

We present VRIJHK photometry of the KH 15D T Tauri binary system for the 2015/2016 and 2016/2017 observing seasons. For the first time in the modern (CCD) era, we are seeing Star B fully emerge from behind the trailing edge of the precessing circumbinary ring during each apastron passage. We are, therefore, able to measure its luminosity and color. Decades of photometry on the system now allow us to infer the effective temperature, radius, mass, and age of each binary component. We find our values to be in good agreement with previous studies, including archival photographic photometry from the era when both stars were fully visible, and they set the stage for a full model of the system that can be constructed once radial velocity measurements are available. We also present the first high-sensitivity radio observations of the system, taken with the Atacama Large Millimeter/submillimeter Array and the Submillimeter Array. The respective 2.0 and 0.88 mm observations provide an upper limit on the circumbinary (gas and dust) disk mass of 1.7 MJup and reveal an extended CO outflow, which overlaps with the position, systemic velocity, and orientation of the KH 15D system and is certainly associated with it. The low velocity, tight collimation, and extended nature of the emission suggest that the outflow is inclined nearly orthogonal to the line of sight, implying it is also orthogonal to the circumbinary ring. The position angle of the radio outflow also agrees precisely with the direction of polarization of the optical emission during the faint phase. A small offset between the optical image of the binary and the central line of the CO outflow remains a puzzle and possible clue to the jet launching mechanism.

[1]  L. Girardi,et al.  A NEW GENERATION OF PARSEC-COLIBRI STELLAR ISOCHRONES INCLUDING THE TP-AGB PHASE , 2017, 1701.08510.

[2]  F. Favata,et al.  CoRoT 223992193: Investigating the variability in a low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk , 2016, 1611.05461.

[3]  B. Tofflemire,et al.  ACCRETION AND MAGNETIC RECONNECTION IN THE CLASSICAL T TAURI BINARY DQ TAU , 2016, 1612.02431.

[4]  W. Herbst,et al.  UNTANGLING THE NEAR-IR SPECTRAL FEATURES IN THE PROTOPLANETARY ENVIRONMENT OF KH 15D , 2016, 1611.09319.

[5]  J. Laskar,et al.  NOMINAL VALUES FOR SELECTED SOLAR AND PLANETARY QUANTITIES: IAU 2015 RESOLUTION B3 , 2016, 1605.09788.

[6]  K. Stassun,et al.  NEW PLEIADES ECLIPSING BINARIES AND A HYADES TRANSITING SYSTEM IDENTIFIED BY K2 , 2016, 1602.01901.

[7]  E. Agol,et al.  SEEING THROUGH THE RING: NEAR-INFRARED PHOTOMETRY OF V582 MON (KH 15D) , 2016, 1602.01877.

[8]  S. Metchev,et al.  Young Stars & Planets Near the Sun, , 2016 .

[9]  M. Pinsonneault,et al.  OLDER AND COLDER: THE IMPACT OF STARSPOTS ON PRE-MAIN-SEQUENCE STELLAR EVOLUTION , 2015, 1506.01393.

[10]  K. Covey,et al.  THE MASS–RADIUS RELATION OF YOUNG STARS. I. USCO 5, AN M4.5 ECLIPSING BINARY IN UPPER SCORPIUS OBSERVED BY K2 , 2015, 1505.02446.

[11]  L. Loinard,et al.  DEEP VLA IMAGES OF THE HH 124 IRS RADIO CLUSTER AND ITS SURROUNDINGS, AND A NEW DETERMINATION OF THE DISTANCE TO NGC 2264 , 2014, 1404.7543.

[12]  W. Herbst,et al.  MULTI-WAVELENGTH PHOTOMETRY OF THE T TAURI BINARY V582 Mon (KH 15D): A NEW EPOCH OF OCCULTATIONS , 2013, 1311.1472.

[13]  E. Mamajek,et al.  INTRINSIC COLORS, TEMPERATURES, AND BOLOMETRIC CORRECTIONS OF PRE-MAIN-SEQUENCE STARS , 2013, 1307.2657.

[14]  F. Favata,et al.  CoRoT ? 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk , 2013, 1311.3990.

[15]  W. Herbst,et al.  LOCATING THE TRAILING EDGE OF THE CIRCUMBINARY RING IN THE KH 15D SYSTEM , 2012, 1208.5497.

[16]  W. Herbst,et al.  COMPLEX VARIABILITY OF THE Hα EMISSION LINE PROFILE OF THE T TAURI BINARY SYSTEM KH 15D: THE INFLUENCE OF ORBITAL PHASE, OCCULTATION BY THE CIRCUMBINARY DISK, AND ACCRETION PHENOMENA , 2012, 1204.1334.

[17]  D. Turner.  The Color-Magnitude Diagram of NGC 2264 , 2011, 1112.5455.

[18]  W. Herbst,et al.  THE LIGHT CURVE OF THE WEAKLY ACCRETING T TAURI BINARY KH 15D FROM 2005–2010: INSIGHTS INTO THE NATURE OF ITS PROTOPLANETARY DISK , 2010, 1007.4212.

[19]  Astronomy,et al.  On the metallicity of open clusters - I. Photometry , 2010, 1008.3476.

[20]  W. Herbst,et al.  BIPOLAR JETS PRODUCED BY A SPECTROSCOPIC BINARY , 2009, 0912.1740.

[21]  K. Covey,et al.  THE DISTANCE TO NGC 2264 , 2009, 0907.3139.

[22]  Devin W. Silvia,et al.  Extending the Model of KH 15D: Estimating the Effects of Forward Scattering and Curvature of the Occulting Ring Edge , 2008, 0803.4275.

[23]  M. Holman,et al.  The Orbit and Occultations of KH 15D , 2006, astro-ph/0602352.

[24]  S. Udry,et al.  Tertiary Companions to Close Spectroscopic Binaries , 2006, astro-ph/0601518.

[25]  L. Abe,et al.  Near-Infrared Photometric Monitoring of the Pre-Main-Sequence Object KH 15D , 2005, astro-ph/0509389.

[26]  W. Herbst,et al.  X-Ray Emission from the Weak-lined T Tauri Binary System KH 15D , 2005, astro-ph/0506167.

[27]  Jonathan P. Williams,et al.  Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective , 2005, astro-ph/0506187.

[28]  J. Winn,et al.  The History of the Mysterious Eclipses of KH 15D. II. Asiago, Kiso, Kitt Peak, Mount Wilson, Palomar, Tautenburg, and Rozhen Observatories, 1954-1997 , 2004, astro-ph/0412498.

[29]  Finland.,et al.  Blue and infrared light curves of the mysterious pre-main-sequence star V582 Mon (KH 15D) from 1955 to 1970 , 2004, astro-ph/0412259.

[30]  J. Bally.  Jets from young stars , 2004 .

[31]  W. Herbst,et al.  KH 15D: A Spectroscopic Binary , 2004, astro-ph/0403099.

[32]  E. Chiang,et al.  The Circumbinary Ring of KH 15D , 2003, astro-ph/0312515.

[33]  M. Holman,et al.  KH 15D: Gradual Occultation of a Pre-Main-Sequence Binary , 2003, astro-ph/0312458.

[34]  J. Winn,et al.  The History of the Mysterious Eclipses of KH 15D: Asiago Observatory, 1967-1982 , 2003, astro-ph/0312428.

[35]  D. Charbonneau,et al.  Spectroscopy of Molecular Hydrogen Emission from KH 15D , 2003, astro-ph/0311608.

[36]  S. Wolf,et al.  Spectropolarimetry and Modeling of the Eclipsing T Tauri Star KH 15D , 2003, astro-ph/0309309.

[37]  C. Bailer-Jones,et al.  Natural Coronagraphic Observations of the Eclipsing T Tauri System KH 15D: Evidence of Accretion and Bipolar Outflow in a Weak-Line T Tauri Star , 2003, astro-ph/0305477.

[38]  C. Bailer-Jones,et al.  Fine Structure in the Circumstellar Environment of a Young, Solar‐like Star: The Unique Eclipses of KH 15D , 2002, astro-ph/0208203.

[39]  W. Herbst,et al.  Eclipses by a Circumstellar Dust Feature in the Pre-main-Sequence Star KH 15D , 2001, astro-ph/0105412.

[40]  M. Bessell,et al.  The Pre-Main-Sequence Stars and Initial Mass Function of NGC 2264 , 2000 .

[41]  W. Herbst,et al.  Additional Periodic Variables in NGC 2264 , 1998 .

[42]  M. Bessell,et al.  UBVRI H(alpha) Photometry of the Young Open Cluster NGC 2264 , 1997 .

[43]  L. Hillenbrand.  On the Stellar Population and Star-Forming History of the Orion Nebula Cluster , 1997 .

[44]  R. Bachiller.  BIPOLAR MOLECULAR OUTFLOWS FROM YOUNG STARS AND PROTOSTARS , 1996 .

[45]  Steven V. W. Beckwith,et al.  Particle Emissivity in Circumstellar Disks , 1991 .

[46]  J. Bieging,et al.  On the radio variability of V410 Tauri , 1989 .

[47]  J. Mathis,et al.  The relationship between infrared, optical, and ultraviolet extinction , 1989 .

[48]  B. Westerlund,et al.  ON THE DISTANCES TO THE YOUNG OPEN CLUSTERS NGC 2244 AND NGC 2264. , 1987 .

[49]  R. Sagar,et al.  Study of the open cluster NGC 2264 , 1983 .

[50]  H. H. Voigt.  Formation of Galaxies , 1982 .

[51]  E. E. Mendoza,et al.  UBVRI photometry in the field of NGC 2264 , 1980 .

[52]  Martin G. Cohen,et al.  Observational studies of pre-main-sequence evolution. , 1979 .

[53]  M. Walker.  Studies of extremely young clusters. I. NGC 2264. , 1956 .