Planet Hunters Talk

Young Stellar Objects

  • TED91 by TED91

    I came across with several stars with interesting light curves. They turned out to be Young Stellar Objects. @davidbundy77 made a collection of them and I tried to find out if they really are YSOs and if they have a known disk. Almost all of them are known YSOs with disks. List is below.

    We should be able to see some transitional disks. In (Scott+, 2014) you can read about how it can look like.

    enter image description here

    Some examples are discuss here and here on page 3.

    EPIC; 2MASS ID; PH ID; SpType; known disk or IR excess Y/N; notes

    204514546; 15564002-2201400; APH0000j6i; A8Ve; Y (VAN DER PLAS+, 2015); Herbig Ae/Be star

    203429083; 15570350-2610081; APH0000fcx; Unknown; Unknown;

    204278916; 16020757-2257467; APH0000idp; M2.5; Y (Luhman+, 2012); T Tauri star

    204248645; 16024575-2304509; APH0000ia6; M5; Y (Luhman+, 2012); T Tauri star, binary system

    204489514; 16030161-2207523; APH0000j3m; M4.75; Y (Luhman+, 2012); T Tauri star

    204856827; 16065937-2032572; APH0000k59; M2.5; Y (Luhman+, 2012); T Tauri star, binary system

    205519771; 16071403-1702425; APH0000mom; M3.5; Y (Rizzuto+, 2015); T Tauri star

    205080616; 16082324-1930009; APH0000ldb; K9; Y (Luhman+, 2012); T Tauri star, NErn of 13" cpm pair

    204472612; 16083419-2211588; APH0000j1m; M5.25-M5; Y; T Tauri star

    204630363; 16100501-2132318; APH0000jkp; M0.0; Y (Rizzuto+, 2015); T Tauri star

    204530046; 16105011-2157481;APH0000j8d; Unknown; Unknown

    204932990; 16115091-2012098; APH0000kk3; M3.5; Y (Luhman+, 2012); T Tauri star

    204399980; 16131158-2229066; APH0000iry; A8IVe; Y (Luhman+, 2012); Herbig Ae/Be star, binary system

    204211116; 16214199-2313432; APH0000i4g; M7.0; Y (Hsieh+, 2013); T Tauri star

    204329690; 16220194-2245410; APH0000ik5; Unknown; Unknown

    204449274; 16222160-2217307; APH0000ixr; M5; Y (Luhman+, 2012); T Tauri star, multiple system

    204195987; 16224494-2317134; APH0000i2b; M6.0; Y (Evans+, 2009); T Tauri star

    204274536; 16233283-2258468; APH0000id3; M5; Y (Evans+, 2009); T Tauri star

    203749770; 16271228-2503526; APH0000gha; Unknown; Unknown

    203806628; 16271448-2451334; APH0000grp; M5; Y (Ozawa+, 2005); T Tauri star, binary system

    203862309; 16274270-2438506; APH0000h2a; M2 ; Y (Gutermuth+, 2009); T Tauri star, multiple system

    203995761; 16281673-2405142; APH0000hjb; K5; Y (Cieza+, 2007); T Tauri star

    204856535; 16070014-2033092; APH0000k55; M2.75; Y (Luhman+, 2012); T Tauri star, binary system

    203850058; 16270659-2441488; APH0000h04; M5.5; Y (MANARA+ 2015); T Tauri star

    204512343; 15572109-2202130; APH0000j6a; Unknown; Unknown

    Posted

  • davidbundy77 by davidbundy77

    Thank you again Ted, the result is better than I expected. It seems this kind of light curve is a very good indication that the star is a YSO with a disk.

    The five "unknown" stars are intriguing. Presumably they were too faint to be included in any previous surveys. All five are targets in proposal GO2063 "Planets Around Likely Young Stars in Upper Sco + Rho Oph", so it is very likely that they are indeed also YSOs.

    I have looked at these five stars on Aladin Lite and all of them are much brighter in the infrared 2MASS photos, which is further evidence that these are good candidates for YSOs with disks. The star 203749770; 16271228-2503526 is quite near to another star which is even brighter in infrared, so there is possibility of interference in the light curve in this case.

    There are surely further examples in the Kepler survey, especially Campaign 2. Martti Holst Kristiansen listed several T-Tauri candidates on "C2 K2 finds" (page3) which I will take a closer look at when I have time. I also encourage other people to post further YSO candidates here.

    Posted

  • davidbundy77 by davidbundy77

    Here some further YSO candidates. The first 14 stars are from Martti's list, the last two were mentioned by Ted here

    EPIC;2MASS ID; SpType; notes;Reference

    203410665;16253849-2613540;K7Ve ;"CD-25 11504 -- Emission-line Star; V896 Sco - Variable Star of Orion Type ";Torres+ , 2006

    203750883;16133650-2503473;M3.5 ;IR excess;Luhman+, 2012

    203791768;16271836-2454537;M3.75 ;T Tauri star, star+dust(IR2);Pillitteri+, 2010

    203824153;16285407-2447442;M2;T Tauri star, YSOc_star+dust(IR4);Hsieh+, 2013

    203843911;16262367-2443138;K5;T Tauri star, disk 37.5 Mjup;Cieza+, 2010

    203936815;16264285-2420299;K6;T Tauri star, YSOc_star+dust(IR3);Hsieh+, 2013

    203937317;16261706-2420216;K4.5;T Tauri star, YSOc_star+dust(IR3), binary;Evans+, 2009

    203950167;16230923-2417047;G0;YSOc_star+dust(IR1) ;Evans+, 2009

    203969672;16270907-2412007;M2.5;T Tauri star, YSOc_star+dust(IR3);Evans+, 2009

    204176565;16221852-2321480;G5;YSOc_star+dust(IR1) ;Evans+, 2009, Hsieh+, 2013

    204206295;16264741-2314521;K5;Herbig Ae/Be star, star+dust(MP1), transition disk type CTD;Evans+, 2003, Kim+ 2013

    204469637;16200616-2212385;M3.5 ;disk type E;Rizzuto+, 2015

    204637622;16042097-2130415;M2;T Tauri star, binary, no IR excess;Luhman+, 2012

    204807722;15570146-2046184;M3.5 ;IR excess;Luhman+, 2012

    204078986;16080745-2345055 ;M6.5;Brown Dwarf, IR excess;Luhman+, 2012

    203920354;16262357-2424394 ;K7;T-Tauri star, YSOc;Hsieh+, 2013

    Posted