2016A&A...587A..56M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST12:30:09

2016A&A...587A..56M - Astronomy and Astrophysics, volume 587A, 56-56 (2016/3-1)

First light of the VLT planet finder SPHERE. II. The physical properties and the architecture of the young systems PZ Telescopii and HD 1160 revisited.

MAIRE A.-L., BONNEFOY M., GINSKI C., VIGAN A., MESSINA S., MESA D., GALICHER R., GRATTON R., DESIDERA S., KOPYTOVA T.G., MILLWARD M., THALMANN C., CLAUDI R.U., EHRENREICH D., ZURLO A., CHAUVIN G., ANTICHI J., BARUFFOLO A., BAZZON A., BEUZIT J.-L., BLANCHARD P., BOCCALETTI A., DE BOER J., CARLE M., CASCONE E., COSTILLE A., DE CAPRIO V., DELBOULBE A., DOHLEN K., DOMINIK C., FELDT M., FUSCO T., GIRARD J.H., GIRO E., GISLER D., GLUCK L., GRY C., HENNING T., HUBIN N., HUGOT E., JAQUET M., KASPER M., LAGRANGE A.-M., LANGLOIS M., LE MIGNANT D., LLORED M., MADEC F., MARTINEZ P., MAWET D., MILLI J., MOELLER-NILSSON O., MOUILLET D., MOULIN T., MOUTOU C., ORIGNE A., PAVLOV A., PETIT C., PRAGT J., PUGET P., RAMOS J., ROCHAT S., ROELFSEMA R., SALASNICH B., SAUVAGE J.-F., SCHMID H.M., TURATTO M., UDRY S., VAKILI F., WAHHAJ Z., WEBER L. and WILDI F.

Abstract (from CDS):

The young systems PZ Tel and HD 1160, hosting known low-mass companions, were observed during the commissioning of the new planet finder of the Very Large Telescope (VLT) SPHERE with several imaging and spectroscopic modes. We aim to refine the physical properties and architecture of both systems. We use SPHERE commissioning data and dedicated Rapid Eye Mount (REM) observations, as well as literature and unpublished data from VLT/SINFONI, VLT/NaCo, Gemini/NICI, and Keck/NIRC2. We derive new photometry and confirm the short-term (P=0.94d) photometric variability of the star PZ Tel A with values of 0.14 and 0.06mag at optical and near-infrared wavelengths, respectively. We note from the comparison to literature data spanning 38 yr that the star also exhibits a long-term variability trend with a brightening of ∼0.25mag. The 0.63-3.8µm spectral energy distribution of PZ Tel B (separation ∼25AU) allows us to revise its physical characteristics: spectral type M7±1, Teff=2700±100K, log(g)<4.5dex, luminosity log(L/L)=-2.51±0.10dex, and mass 38-72MJ from ``hot-start'' evolutionary models combining the ranges of the temperature and luminosity estimates. The 1-3.8µm SED of HD 1160 B (∼85au) suggests a massive brown dwarf or a low-mass star with spectral type M6.0+1.0–0.5, Teff=3000±100K, subsolar metallicity [M/H]=-0.5-0.0dex, luminosity log(L/L)=-2.81±0.10dex, and mass 39-166MJ. The physical properties derived for HD 1160 C (∼560au) from KsL'-band photometry are consistent with the discovery study. The orbital study of PZ Tel B confirms its deceleration and the high eccentricity of its orbit (e>0.66). For eccentricities below 0.9, the inclination, longitude of the ascending node, and time of periastron passage are well constrained. In particular, both star and companion inclinations are compatible with a system seen edge-on. Based on ``hot-start'' evolutionary models, we reject other brown dwarf candidates outside 0.25'' for both systems, and giant planet companions outside 0.5'' that are more massive than 3MJ for the PZ Tel system. We also show that K1-K2 color can be used along with YJH low-resolution spectra to identify young L-type companions, provided high photometric accuracy (≤0.05mag) is achieved. SPHERE opens new horizons in the study of young brown dwarfs and giant exoplanets using direct imaging thanks to high-contrast imaging capabilities at optical (0.5-0.9µm) and near-infrared (0.95-2.3µm) wavelengths, as well as high signal-to-noise spectroscopy in the near-infrared domain (0.95-2.3µm) from low resolutions (R∼30-50) to medium resolutions (R∼350).

Abstract Copyright:

Journal keyword(s): brown dwarfs - stars: individual: PZ Telescopii - stars: individual: HD 1160 - techniques: high angular resolution - techniques: image processing - techniques: spectroscopic

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 984 ** 00 14 10.2530723028 -07 11 56.814225050   7.82 7.32     F7V 75 0
2 HD 1160C LM* 00 15 57.2389782387 +04 15 09.090222186           M3.5 10 0
3 HD 1160B LM* 00 15 57.26 +04 15 03.7           ~ 24 0
4 HD 1160 * 00 15 57.3020078544 +04 15 04.004951787   7.159 7.119     A0V 75 1
5 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
6 LEHPM 1481B BD* 01 22 50.86 -24 39 51.6           L4-6 24 0
7 2MASSW J0335020+234235 LM* 03 35 02.0920098507 +23 42 35.415191371       17.67   M8.5V 47 0
8 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2979 0
9 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 58 0
10 CD-35 2722B BD* 06 09 19.2082646634 -35 49 31.062882043           L0-1 52 0
11 HD 44627B BD* 06 19 12.94 -58 03 20.9           L1 110 1
12 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 633 0
13 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
14 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 118 0
15 CD-26 8623B TT* 11 32 41.1729967174 -26 52 09.110626414   16.70 15.22 13.68 11.76 M5.5 66 0
16 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 96 0
17 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 310 0
18 TWA 11C PM* 12 35 48.9385574403 -39 50 24.567547160   15.94 14.43 14.07   ~ 27 0
19 UScoCTIO 75 LM* 16 00 30.2343779838 -23 34 45.617534170           M6e 32 0
20 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 40 0
21 RX J1609.5-2105B LM* 16 09 30.37 -21 04 57.0           ~ 94 0
22 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
23 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
24 VB 8 Fl* 16 55 35.2561420232 -08 23 40.752903617   18.7 16.916 14.566 12.24 M7Ve 381 0
25 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2505 0
26 TYC 8381-2548-1 * 18 52 55.3978394621 -50 09 13.236851909   11.588 10.436     ~ 2 0
27 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 286 0
28 2MASS J18531926-5014042 * 18 53 19.2621329423 -50 14 04.255230771           ~ 1 0
29 CD-50 12193 * 18 53 28.0256530709 -50 13 08.315763963   11.85 10.13     ~ 2 0
30 VB 10 Er* 19 16 57.6103282334 +05 09 01.588675251     17.30     M8V 435 1
31 HD 203030B BD* 21 18 58.97 +26 13 46.1           L7.5 57 0
32 NAME Octans-near MGr ~ ~           ~ 17 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-12:30:09

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