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chronos

young stars in associations, moving groups, and star forming regions

Examples

See more in examples.

Scripts

Cluster membership plots

To find the nearest cluster to TOI 580 (Gaia DR2 5519619186857962112) with cluster membership plots shown:

./find_cluster_near_target 5519619186857962112 -p

img img img

Try the following Gaia DR2 ids of known planet hosts in a cluster:

  • K2-25: 3311804515502788352 in Hyades
  • K2-33: 6245758900889486720
  • K2-95: 659744295638254336 in NGC_2632 (Praesepe)
  • K2-100: 664337230586013312 in NGC_2632 (Praesepe)
  • K2-136: 145916050683920128 in Hyades
  • K2-264: 661167785238757376 in NGC_2632 (Praesepe)
  • K2-284: 3413793491812093824
  • CVSO 30: 3222255959210123904 in ASCC_16
  • HD 222259A: 6387058411482257536

CDIPS lightcurves

./make_cdips_ql 5519619186857962112 -p

chronos provides an API to download CDIPS lightcurve from mast.

from chronos import Target, CDIPS
from chronos.utils import get_toi

toi = 681
t = Target(toiid=toi, verbose=False)
#get gaia id
t.query_gaia_dr2_catalog(return_nearest_xmatch=True)
#initialize cdips
cdips = CDIPS(gaiaDR2id=t.gaiaid, sector=7, aper_idx=3, verbose=False)
#get lc and turn into lk.TessLightCurve
lc = cdips.lc
#add label
lc.label = f'TOI {toi}.01'
#get ephemeris from TOI release (https://tev.mit.edu/data/)
d = get_toi(toi=f'{toi}.01', verbose=False)
per, t0 = d[['Period (days)', 'Epoch (BJD)']].values[0]
#plot
ax = lc.remove_outliers().flatten(window_length=51).fold(period=per, t0=t0).scatter()
ax.set_xlim([-0.05,0.05])

img