35¸÷ǯÀè¤Î·Ï³°ÏÇÀ±¤ò¾ÜºÙ¤Ë´Ñ¬¡¢¥Ï¥Ó¥¿¥Ö¥ë¥¾¡¼¥óÆâ¤Ë¿·¤¿¤ÊÏÇÀ±¤¬Â¸ºß¤«
¡Ú¢¥ ÂÀÍ۷ϳ°ÏÇÀ±¡ÖL 98-59b¡×¡Êº¸¡Ë¤òÉÁ¤¤¤¿ÁÛÁü¿Þ¡ÊCredit: ESO/M. Kornmesser¡Ë¡Û
ÆîÅ·¤Î¡Ö¤È¤Ó¤¦¤ªºÂ¡×¤ÎÊý¸þ¤ª¤è¤½35¸÷ǯÀè¤Ë¤¢¤ëÀÖ¿§âäÀ±¡ÖL 98-59¡×¤Î¼þ°Ï¤Ç¤Ï¡¢¥¢¥á¥ê¥«¹Ò¶õ±§Ãè¶É¡ÊNASA¡Ë¤Î·Ï³°ÏÇÀ±Ãµºº±ÒÀ±¡ÖTESS¡×¤Ë¤è¤ë¥È¥é¥ó¥¸¥Ã¥ÈË¡¡Ê¸å½Ò¡Ë¤òÍøÍѤ·¤¿´Ñ¬¥Ç¡¼¥¿¤ò¤â¤È¤Ë¡¢Ãϵå¤Ë¶á¤¤¥µ¥¤¥º¤ÎÂÀÍ۷ϳ°ÏÇÀ±¤¬3¤Ä¸«¤Ä¤«¤Ã¤¿¤³¤È¤¬2019ǯ¤Ëȯɽ¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
´ØÏ¢¡§Ãϵå¤È²ÐÀ±¤ÎÃæ´Ö¥µ¥¤¥º¤Î·Ï³°ÏÇÀ±¤òȯ¸«¡£TESS¥ß¥Ã¥·¥ç¥ó¤ÇºÇ¾®µÏ¿¤ò¹¹¿·
º£²ó¡¢¥Ý¥ë¥ÈÂç³Ø¤ÎOlivier Demangeon»á¤é¤Î¸¦µæ¥°¥ë¡¼¥×¤Ï¡¢L 98-59·Ï¤Çȯ¸«ºÑ¤ß¤Î3¤Ä¤Î·Ï³°ÏÇÀ±¤Ë´Ø¤¹¤ë¿·¤·¤¤´Ñ¬·ë²Ì¤Ë²Ã¤¨¤Æ¡¢¿·¤¿¤Ë1¤Ä¤Î·Ï³°ÏÇÀ±¤¬¸«¤Ä¤«¤Ã¤¿¤³¤È¤È¡¢¤µ¤é¤Ë¤â¤¦1¤Ä¤Î·Ï³°ÏÇÀ±¤¬Â¸ºß¤¹¤ë²ÄǽÀ¤ò¼¨¤·¤¿¸¦µæÀ®²Ì¤òȯɽ¤·¤Þ¤·¤¿¡£
¢£»ëÀþ®ÅÙË¡¤Ç´Ñ¬¤µ¤ì¤¿·Ï³°ÏÇÀ±¤È¤·¤Æ¤ÏºÇ¤â·Ú¤«¤Ã¤¿¡ÖL 98-59b¡×
·Ï³°ÏÇÀ±¤ÎÀ¼Á¤òÄ´¤Ù¤ë¾å¤Ç¡¢¤½¤Î¥µ¥¤¥º¤È¼ÁÎ̤«¤é»»½Ð¤µ¤ì¤ëÊ¿¶ÑÌ©Å٤ϽÅÍפʾðÊó¤Ç¤¹¡£Ê¿¶ÑÌ©ÅÙ¤¬¤ï¤«¤ì¤Ð¡¢¤½¤ÎÏÇÀ±¤ò¹½À®¤¹¤ëʪ¼Á¤ÎÁÈÀ®¤ò¿äÄê¤Ç¤¤ë¤«¤é¤Ç¤¹¡£¡Ö¤â¤·¤âÏÇÀ±¤¬²¿¤Ç¤Ç¤¤Æ¤¤¤ë¤Î¤«¤òÃΤꤿ¤±¤ì¤Ð¡¢ºÇÄã¤Ç¤â¼ÁÎ̤ÈȾ·Â¤òÃΤëɬÍפ¬¤¢¤ê¤Þ¤¹¡×¡ÊDemangeon»á¡Ë
º£²ó¡¢¸¦µæ¥°¥ë¡¼¥×¤Ï¥è¡¼¥í¥Ã¥ÑÆîŷŷʸÂæ¡ÊESO¡Ë¤Î¡ÖĶÂ緿˾±ó¶À¡ÊVLT¡Ë¡×¤Ë¤è¤ë»ëÀþ®ÅÙË¡¡Ê¸å½Ò¡Ë¤òÍѤ¤¤¿´Ñ¬¥Ç¡¼¥¿¤òÍøÍѤ¹¤ë¤³¤È¤Ç¡¢L 98-59·Ï¤Ç¤¹¤Ç¤Ë¸«¤Ä¤«¤Ã¤Æ¤¤¤ë3¤Ä¤Î·Ï³°ÏÇÀ±¡ÖL 98-59b¡×¡ÖL 98-59c¡×¡ÖL 98-59d¡×¤Î¼ÁÎ̤ò³ä¤ê½Ð¤¹¤³¤È¤ËÀ®¸ù¤·¤Þ¤·¤¿¡£
¸¦µæ¥°¥ë¡¼¥×¤Ë¤è¤ë¤È¡¢ºÇ¤âÆ⦤ò¸øž¤¹¤ëL 98-59b¤Î¼ÁÎ̤ÏÃϵå¤ÎÌó0.40Çܤǡ¢¤³¤ì¤Þ¤Ç¤Ë»ëÀþ®ÅÙË¡¤òÍøÍѤ·¤Æ´Ñ¬¤µ¤ì¤¿·Ï³°ÏÇÀ±¤È¤·¤Æ¤ÏºÇ¤â·Ú¤¤¤È¤µ¤ì¤Æ¤¤¤Þ¤¹¡£¤Þ¤¿¡¢¤½¤Î³°Â¦¤ò¸øž¤¹¤ëL 98-59c¤Î¼ÁÎ̤ÏÃϵå¤ÎÌó2.22ÇÜ¡¢¤µ¤é¤Ë³°Â¦¤ÎL 98-59d¤Î¼ÁÎ̤ÏÃϵå¤ÎÌó1.94ÇܤǤ¢¤ë¤³¤È¤¬È½ÌÀ¤·¤Þ¤·¤¿¡£¤Ê¤ª¡¢3¤Ä¤Î·Ï³°ÏÇÀ±¤ÎȾ·Â¤ÏÃϵå¤ÎÌó0.850ÇÜ¡ÊL 98-59b¡Ë¡¢Ìó1.385ÇÜ¡ÊƱc¡Ë¡¢Ìó1.521ÇÜ¡ÊƱd¡Ë¤È¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
¢¥¼ÁÎ̤κÇÂç30¥Ñ¡¼¥»¥ó¥È¤ò¿å¤¬Àê¤á¤ë²ÄǽÀ¤¬¤¢¤ëL 98-59d¤ÎÁÛÁü¿Þ¢¥
¡ÊCredit: ESO/M. Kornmesser¡Ë
3¤Ä¤ÎÏÇÀ±¤Ï¤¤¤º¤ì¤â¼çÀ±¤Ç¤¢¤ëL 98-59¤Ë¶á¤¯¡¢É½Ì̲¹ÅÙ¤ÏÃϵå¤è¤ê¤â¤º¤Ã¤È¹â¤¤¡ÊÊ¿¹Õ²¹ÅÙ¤ÏÀݻᤪ¤è¤½140¡Á350Å١ˤȤߤé¤ì¤Æ¤¤¤Þ¤¹¤¬¡¢¸¦µæ¥°¥ë¡¼¥×¤Ïº£²ó¤Î´Ñ¬·ë²Ì¤ò¤â¤È¤Ë¡¢3¤Ä¤ÎÏÇÀ±¤ÎÆâÉô¤â¤·¤¯¤ÏÂ絤Ãæ¤Ë¿å¤¬´Þ¤Þ¤ì¤Æ¤¤¤ë²ÄǽÀ¤¬¤¢¤ë¤È¹Í¤¨¤Æ¤¤¤Þ¤¹¡£
Æäˡ¢3¤Ä¤Î¤¦¤Á°ìÈÖ³°Â¦¤ÎL 98-59d¤Ï¼ÁÎ̤Τ¦¤ÁºÇÂç30¥Ñ¡¼¥»¥ó¥È¤ò¿å¤¬Àê¤á¤ë¤È¤ß¤é¤ì¤Æ¤¤¤Æ¡¢³¤ÍÎÏÇÀ±¡Ê¿¼¤¤³¤¤Ëʤ¤ï¤ì¤¿ÏÇÀ±¡Ë¤Î²ÄǽÀ¤¬¤¢¤ë¤È¤¤¤¤¤Þ¤¹¡£¤¤¤Ã¤Ý¤¦¡¢Æ⦤ÎL 98-59b¤ÈL 98-59c¤Ï´¥Á礷¤Æ¤¤¤Æ¡¢´Þ¤Þ¤ì¤ë¿å¤ÎÎ̤Ͼ¯¤Ê¤¤¤È¿ä¬¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
¤Þ¤¿¡¢¸¦µæ¥°¥ë¡¼¥×¤ÏL 98-59·Ï¤Ç4¤ÄÌܤȤʤë·Ï³°ÏÇÀ±¡ÖL 98-59e¡×¤òȯ¸«¤·¤Þ¤·¤¿¡£L 98-59e¤Î¥µ¥¤¥º¤Ïº£¤Î¤È¤³¤íÉÔÌÀ¤Ç¤¹¤¬¡¢¼ÁÎ̤ÏÃϵå¤ÎÌó3.06Çܰʾ塢¸øž¼þ´ü¤ÏÌó12.8Æü¤È¤µ¤ì¤Æ¤¤¤Þ¤¹¡£¤µ¤é¤Ë¡¢L 98-59e¤Î³°Â¦¤Ë¤â¤¦1¤Ä¤Î·Ï³°ÏÇÀ±¤¬Â¸ºß¤¹¤ë²ÄǽÀ¤â¸¦µæ¥°¥ë¡¼¥×¤Ï»ØŦ¤·¤Æ¤¤¤Þ¤¹¡£¿äÄꤵ¤ì¤ëºÇ¾®¼ÁÎ̤ÏÃϵå¤ÎÌó2.46ÇÜ¡¢¸øž¼þ´ü¤ÏÌó23.2Æü¤Ç¡¢¤â¤·¤â¸ºß¤¹¤ì¤ÐL 98-59¤Î¼þ°Ï¤Ë¹¤¬¤ë¥Ï¥Ó¥¿¥Ö¥ë¥¾¡¼¥ó¤Î¿¿¤óÃæ¤Ë°ÌÃÖ¤¹¤ë¤È¤µ¤ì¤Æ¤ª¤ê¡¢º£¸å¤Î´Ñ¬·ë²Ì¤¬ÃíÌܤµ¤ì¤Þ¤¹¡£
¡Ú¢¥ L 98-59·Ï¡Ê¾åÃʡˤÈÂÀÍ۷ϤÎÏÇÀ±¡Ê²¼ÃÊ¡¢¿åÀ±¡ÁÃϵå¤Þ¤Ç¡Ë¤ÎÈæ³Ó¿Þ¡£Àµ³Î¤Ê¥µ¥¤¥º¤ä¼ÁÎ̤¬È½ÌÀ¤·¤Æ¤¤¤Ê¤¤L 98-59·Ï¤Î2¤Ä¤ÎÏÇÀ±¤Ë¤Ä¤¤¤Æ¤ÏÎسԤ¬ÅÀÀþ¤ÇÉÁ¤«¤ì¤Æ¤¤¤ë¡£²£¼´¤Îñ°Ì¤ÏÀäÂв¹ÅÙ¡Ê¥±¥ë¥Ó¥ó¡Ë¡ÊCredit: ESO/L. Calçada/M. Kornmesser (Acknowledgment: O. Demangeon)¡Ë¡Û
¢£¥È¥é¥ó¥¸¥Ã¥ÈË¡¡õ»ëÀþ®ÅÙË¡¤È¤Ï
¤³¤ì¤Þ¤Ç¤Ë¸«¤Ä¤«¤Ã¤¿4400¸Ä°Ê¾å¤Î·Ï³°ÏÇÀ±¤Î¤Ê¤«¤Ë¤ÏľÀÜ»£±Æ¤µ¤ì¤¿¤â¤Î¤â¤¢¤ê¤Þ¤¹¤¬¡¢¤½¤Î¿¤¯¤Ï¡Ö¥È¥é¥ó¥¸¥Ã¥ÈË¡¡×¤ä¡Ö»ëÀþ®ÅÙË¡¡×¡Ê¤Þ¤¿¤Ï¥É¥Ã¥×¥é¡¼Ë¡¡Ë¤È¤¤¤Ã¤¿´ÖÀÜŪ¤Ê¼êË¡¤òÍѤ¤¤Æ¸¡½Ð¤µ¤ì¤Æ¤¤Þ¤·¤¿¡£
¥È¥é¥ó¥¸¥Ã¥ÈË¡¤È¤Ï¡¢·Ï³°ÏÇÀ±¤¬¼çÀ±¡Ê¹±À±¡Ë¤Î¼êÁ°¤ò²£ÀÚ¤ë¡Ö¥È¥é¥ó¥¸¥Ã¥È¡Êtransit¡Ë¡×¤òµ¯¤³¤·¤¿ºÝ¤ËÀ¸¤¸¤ë¼çÀ±¤ÎÌÀ¤ë¤µ¤Î¤ï¤º¤«¤ÊÊѲ½¤ò¤â¤È¤Ë¡¢·Ï³°ÏÇÀ±¤ò¸¡½Ð¤¹¤ë¼êË¡¤Î¤³¤È¡£ºÇ½é¤ËL 98-59·Ï¤Î·Ï³°ÏÇÀ±¤òȯ¸«¤·¤¿TESS¤Ï¤³¤Î¼êË¡¤òÍѤ¤¤Æ¤¤¤Þ¤¹¡£
¢¥·Ï³°ÏÇÀ±¤Î¥È¥é¥ó¥¸¥Ã¥È¤Ë¤è¤Ã¤Æ¹±À±¤ÎÌÀ¤ë¤µ¤¬ÊѲ½¤¹¤ëÍͻҤò¼¨¤·¤¿Æ°²è¢¥
¡ÊCredit: ESO/L. Calçada¡Ë
¤â¤¦°ì¤Ä¤Î»ëÀþ®ÅÙË¡¤È¤Ï¡¢·Ï³°ÏÇÀ±¤Î¸øž¤Ë¤È¤â¤Ê¤Ã¤Æ±ß¤òÉÁ¤¯¤è¤¦¤Ë¤ï¤º¤«¤ËÍɤµ¤Ö¤é¤ì¤ë¼çÀ±¤ÎÆ°¤¤Î¤¦¤Á¡¢Ãϵ夫¤é¸«¤¿»ëÀþÊý¸þ¤ÎÆ°¤¤ò¼çÀ±¤Î¸÷¤Î¤ï¤º¤«¤ÊÊѲ½¡Ê¼çÀ±¤¬Ãϵå¤Ë¶áÉÕ¤¯¤è¤¦¤ËÆ°¤¯»þ¤Ï¸÷¤Î¿§¤¬ÀĤäݤ¯¡¢±ó¤¶¤«¤ë¤è¤¦¤ËÆ°¤¯»þ¤ÏÀ֤äݤ¯ÊѲ½¤¹¤ë¡Ë¤ò¤â¤È¤Ëª¤¨¤Æ¡¢·Ï³°ÏÇÀ±¤ò¸¡½Ð¤¹¤ë¼êË¡¤Ç¤¹¡£
¡Ú¢¥ »ëÀþ®ÅÙË¡¤Î´Êñ¤Ê»ÅÁȤߡ£·Ï³°ÏÇÀ±¡ÊEXOPLANET¡Ë¤ËÍɤµ¤Ö¤é¤ì¤ë¼çÀ±¡ÊHOST STAR¡Ë¤Î¿§¤¬¤ï¤º¤«¤ËÊѲ½¤¹¤ëÍͻҤòª¤¨¤ë¤³¤È¤Ç¡¢´ÖÀÜŪ¤Ë·Ï³°ÏÇÀ±¤Î¾ðÊó¤òÆÀ¤ë¤³¤È¤¬¤Ç¤¤ë¡ÊCredit: ESO¡Ë¡Û
´ØÏ¢¡§4000¤òĶ¤¨¤ëÂÀÍ۷ϳ°ÏÇÀ±¤Îȯ¸«¤ò»þ·ÏÎó¤ÇÁíÍ÷¡¡NASA¤Î¥¢¡¼¥«¥¤¥Ö¥Ç¡¼¥¿
Image Credit: ESO/M. Kornmesser
Source: ESO
ʸ¡¿¾¾Â¼Éð¹¨